Custom Practice Test

Biology

1. When compared to the wall of a typical vein, the wall of a typical artery will show a well developed:

1.	Tunica intima	2.	Tunica media
3.	Tunica externa	4.	Tunica albuginea

2. The two main phagocytes in the human blood include neutrophils and:

1.	Lymphocytes	2.	Basophils
3.	Monocytes	4.	Eosinophils

3. 'Lub' sound of heart is caused by the ___________.
1. closure of the semilunar valves
2. opening of tricuspid and bicuspid valves
3. opening of the semilunar valves
4. closure of the tricuspid and bicuspid valves

4. Cardiac output is

1.	Volume of blood pumped by each ventricle in each cardiac cycle
2.	Volume of blood pumped out by each ventricle per minute
3.	5 litres in a healthy individual
4.	Both (2) and (3)

5.

Assertion(A):	A decrease in lymphocyte count in the blood will lead to an increased susceptibility to infections.
Reason(R):	Lymphocytes are responsible for phagocytosis in innate immune response.

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	(A) is False but (R) is True.

6. When compared to the adult red blood cells in human blood, the adult white blood cells are:
I: lesser in number
II: longer lived
III: nucleated
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct

7. Consider the given two statements:

Statement I:	The normal blood pressure of a healthy adult is approximately 120/80 mm Hg.
Statement II:	The systolic pressure is the pressure during the relaxation of the heart.

1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect

8.

The QRS complex in a standard ECG represents:

1.	Depolarisation of auricles	2.	Depolarisation of ventricles
3.	Repolarisation of ventricles	4.	Repolarisation of auricles

9.

All the components of the nodal tissue are autoexcitable. Why does the SA node act as the normal pacemaker?

1.	SA node has the lowest rate of depolarisation
2.	SA node is the only component to generate the threshold potential.
3.	Only SA node can convey the action potential to the other
4.	SA node has the highest rate of depolarisation.

10. Identify the most common WBC shown in the figure:

1.	Basophil	2.	Eosinophil
3.	Monocyte	4.	Neutrophil

11. Match each item in Column-I with one in Column-II and select the correct match from the codes given:

	Column-I		Column-II
A.	Heart failure	P.	Sudden stoppage of heart beating
B.	Heart attack	Q.	Heart muscle is damaged by inadequate blood supply
C.	Cardiac arrest	R.	Electrical signals in heart are blocked
		S.	Heart can't pump enough oxygen-rich blood to meet body's needs

Codes:

	A	B	C
1.	R	Q	P
2.	R	P	S
3.	S	Q	P
4.	S	Q	R

12. Consider the given two statements:

Assertion (A):	The SA node is the natural pacemaker of the human heart.
Reason (R):	The sinoatrial (SA) node is a small, specialized cluster of cells located in the right atrium of the heart.

1.	Both (A) and (R) are True and (R) correctly explains (A).
2.	Both (A) and (R) are True but (R) does not correctly explain (A).
3.	(A) is True but (R) is False
4.	Both (A) and (R) are False

13. Consider the given two statements:

Assertion (A):	Plasma is the main medium for the transport of oxygen in the blood.
Reason (R):	Plasma contains a high percentage of water and proteins like albumin and fibrinogen.

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	(A) is False but (R) is True.

14. Identify the correct chronological arrangement of the components of the cardiac conduction nodal tissue:

1.	SA node, AV bundle, AV node, Purkinje fibers
2.	SA node, AV node, AV bundle, Purkinje fibers
3.	AV node, AV bundle, SA node, Purkinje fibers
4.	AV node, SA node, Purkinje fibers, AV bundle

15. Which plasma protein plays the most significant role in osmotic balance and maintaining blood volume?
1. Fibrinogen
2. Albumin
3. Immunoglobulins
4. Prothrombin

16. Which of the following major plasma proteins is primarily responsible for helping in the maintenance of colloid osmotic balance in the intravascular fluid?
1. Albumin
2. α Globulin
3. β Globulin
4. γ Globulin

17. Neural signals through the sympathetic nerves (part of ANS) can increase the:

I:	rate of heartbeat
II:	strength of ventricular contraction
III:	cardiac output

1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III

18. Which of the following events is usually not seen in a standard ECG?
1. Depolarisation of atria
2. Depolarisation of ventricles
3. Repolarisation of ventricles
4. Repolarisation of atria

19.

Match the plasma proteins in Column-I with their function in Column-II and select the correct answer from the codes given:

	Column-I		Column-II
A.	Albumins	a.	Hemostasis
B.	Globulins	b.	Transport carriers and immunity
C.	Fibrinogen	c.	Colloid osmotic pressure

Codes:

	A	B	C
1.	a	b	c
2.	a	c	b
3.	b	a	c
4.	c	b	a

20. How many of the given statements regarding leucocytes in human are true?

I.	Neutrophils are the most abundant cells (60-65 percent) of the total WBCs.
II:	Basophils are the least (0.5-1 percent) of the total WBCs.
III:	Neutrophils and monocytes (6-8 percent) are phagocytic cells.
IV:	Basophils secrete histamine, serotonin, heparin, etc., and are involved in inflammatory reactions.
V:	Eosinophils (2-3 percent) resist infections and are also associated with allergic reactions.
VI:	Lymphocytes (20-25 percent) are responsible for immune responses of the body.

1.	3	2.	4
3.	5	4.	6

21. Match the following major plasma proteins with their functions:

	Column A		Column B
1.	Albumin	A.	Blood clotting
2.	Globulin	B.	Colloid osmotic pressure
3.	Fibrinogen	C.	Immune responses

Options:

1.	1-B, 2-A, 3-C	2.	1-A, 2-B, 3-C
3.	1-C, 2-A, 3-B	4.	1-B, 2-C, 3-A

22. The first and the second heart sounds are produced respectively by:

1.	the closure of the atrioventricular and the opening of the semilunar valves
2.	the opening of the atrioventricular and the closure of the semilunar valves
3.	the closure of the atrioventricular and semilunar valves
4.	the opening of the atrioventricular and semilunar valves

23. When the heart muscle is suddenly damaged by an inadequate blood supply, the condition is called as

1.	Heart Attack	2.	Heart Failure
3.	Cardiac Arrest	4.	Angina pectoris

24. Which of the following values will not be normal for a healthy person?
1. 10 gms of haemoglobin per 100 ml of blood
2. 5 million RBC per mm³
3. 7000 WBC per mm³
4. 200000 platelets per mm³

25. Identify the incorrect statement:

1.	A person with blood group type A has type A antigens on RBC and does not have type B antigen on RBC.
2.	A person with blood group type B has anti A antibodies in plasma and does not have anti B antibodies in plasma.
3.	A person with type AB blood group has type A antigen and type B antigen on RBC but does not have anti A or anti B antibodies in plasma.
4.	A person with blood group type O can receive blood from all types of blood group namely AB, A, B, and O.

26. Which of the following white blood cells is not correctly matched to its abundance out of the total white blood cells in a healthy human being?

1.	Neutrophils	60 – 65 %
2.	Eosinophils	2 – 3 %
3.	Monocytes	6 – 8 %
4.	Basophils	20 – 25 %

27. The correct differential white blood cell count [in order from most common to least common] will be:

1.	basophils, eosinophils, monocytes, lymphocytes, neutrophils
2.	lymphocytes, neutrophils, monocytes, eosinophils, basophils
3.	neutrophils, monocytes, lymphocytes, basophils, eosinophils
4.	neutrophils, lymphocytes, monocytes, eosinophils, basophils

28. What is incorrect regarding human heart?
1. It is neurogenic
2. It is derived from embryonic mesoderm
3. It is a muscular pump
4. It is located in thorax between the lungs

29. Regarding leucocytes:

I:	They are nucleated.
II:	Neutrophils, eosinophils and basophils are different types of granulocytes.
III:	Lymphocytes and monocytes are the agranulocytes.

1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct

30. The most frequent and the least frequent white blood cells in the blood of a healthy adult human will, respectively, be:
1. Neutrophil and Eosinophil
2. Lymphocyte and Basophil
3. Neutrophil and Basophil
4. Lymphocyte and Monocyte

31.

Match each item in Column I with ONLY one in Column II and select the correct match from the codes given:

	Column I		Column II
A	P wave	P	Ventricular repolarisation
B	QRS complex	Q	Atrial depolarisation
C	T wave	R	Atrial repolarisation
		S	Ventricular depolarisation

Codes:

	A	B	C
1.	P	Q	R
2.	Q	S	R
3.	Q	R	S
4.	Q	S	P

32.

A specialised nodal tissue embedded in the lower corner of the right atrium, close to atrio-ventricular septum, delays the spreading of impulses to heart apex for about 0.1 sec.
This delay allows -
1. blood to enter aorta.
2. the ventricles to empty completely.
3. blood to enter pulmonary arteries.
4. the atria to empty completely.

33. Match each item in Column I with one item in Column II and select the best match from the codes given:

	Column I		Column II
A.	Neutrophils	P.	Defense against parasitic infections
B.	Basophils	Q.	Release of histamine in inflammation
C.	Eosinophils	R.	Phagocytosis of foreign organisms
D.	Lymphocytes	S.	Production of antibodies

Options	A	B	C	D
1.	P	R	Q	S
2.	R	Q	P	S
3.	R	P	Q	S
4.	Q	R	S	P

34. Consider the given two statements:

Assertion (A):	The sinoatrial node (SAN) is called the pacemaker of the heart.
Reason (R):	The SAN generates the maximum number of action potentials per minute in the heart.

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	(A) is False but (R) is True.

35. Identify the correct statement regarding the atrioventricular (AV) valves:

1.	A bicuspid valve is present between the right atrium and right ventricle.
2.	A bicuspid valve is present between the right atrium and right ventricle.
3.	Bicuspid valve is also called as the mitral valve.
4.	AV valves normally prevent the backflow of blood from the atria to the ventricles.

36. In the ABO blood group system, the blood type AB means:

1.	Anti-A and anti-B antibodies are present in the plasma
2.	The absence of A and B antigens on the red cells
3.	The presence of both A and B antigens on the red cells
4.	The presence of anti-A and anti-B antigens on the red cells

37. Which of the following recording of the blood pressure in a human adult will not be considered as abnormal?
1. 120/100 mm Hg
2. 110/70 mm Hg
3. 170/80 mm Hg
4. 150/95 mm Hg

38.

The least common of WBCs in the human blood are:

1.	Eosinophils	2.	Lymphocytes
3.	Neutrophils	4.	Basophils

39. What is the type of antibody found in the plasma of a person whose RBCs have type B antigen on the surface?
1. anti-A
2. anti-B
3. both anti-A and anti-B
4. neither anti-A nor anti-B

40. Number of QRS complexes that occur in the ECG in a given time period determine
1. Cardiac output
2. Stroke volume
3. Heartbeat rate
4. Strength of heart

41. Which of the following statements about white blood cells (leukocytes) is NOT correct?

1.	Neutrophils are the most abundant type of white blood cells in most mammals and form an essential part of the innate immune system.
2.	Lymphocytes are involved in the creation of antibodies, which are crucial for the adaptive immune response.
3.	Monocytes mature into macrophages and dendritic cells, which can engulf and destroy pathogens through phagocytosis.
4.	Eosinophils are primarily responsible for the body's response to parasitic infections and are the predominant white blood cell type in human blood

42. Angina pectoris is primarily caused by:

1.	Complete blockage of a coronary artery, leading to myocardial infarction.
2.	Reduced blood flow to the heart muscle due to partial coronary artery blockage.
3.	Rupture of a blood vessel in the brain, causing a stroke.
4.	Inflammation of the pericardium due to infection.

43.

Serum differs from blood plasma in:

1.	lacking globulins	2.	lacking albumins
3.	lacking clotting factors	4.	lacking antibodies

44.

To prevent eryhtroblastosis fetalis in future pregnancies:

1.	Anti-Rh Immunoglobulins must be given to Rh –ve mothers at the time of each delivery
2.	Anti-Rh Immunoglobulins must be given to new born at the time of each delivery
3.	Rh Antigens must be given to new born at the time of each delivery
4.	Anti Antigens must be given to Rh –ve mothers at the time of each delivery

45.

Which of these statements about the ABO blood group is NOT true?

1.	A person with type O blood can donate blood to individuals with type A, B, AB, or O blood types.
2.	Transfusions should be made considering the plasma of the donor and the erythrocytes of the patient (recipient).
3.	A person with type A blood should not receive a transfusion from someone with type AB blood.
4.	A person with type O blood has both the A and B antigens.

46. The semilunar valves close at the beginning of

1.	atrial systole	2.	atrial diastole
3.	ventricular systole	4.	ventricular diastole

47. How many of the following statements about the human heart are correct?

I:	The tricuspid valve is present between the left atrium and left ventricle.
II:	Purkinje fibers help in conducting the cardiac impulse to the myocardium of ventricles.
III:	The sinoatrial node acts as the pacemaker of the heart.
IV:	Atrial contraction increases the ventricular filling.

1. One
2. Two
3. Three
4. Four

48. Which of the following correctly describes the cardiac output?

1.	The amount of blood pumped by both ventricles combined in one heartbeat.
2.	The volume of blood pumped by each ventricle per minute.
3.	The amount of blood ejected by each atrium per minute.
4.	The sum of the volumes of oxygenated and deoxygenated blood in the body.

49.

What causes heart ventricles to fill with blood?
I. Atrial contraction
II. Closing of atrio-ventricular valves
III. Opening of semilunar valves
1. I only
2. I and II only
3. II and III only
4. III only

50. Consider the two statements:

Statement I:	People who are blood type O have both anti-A and anti-B antibodies present in their plasma.
Statement II:	People who are blood type AB do not produce either anti-A or anti-B antibodies.

1. Statement I is correct: Statement II is incorrect
2. Statement I is incorrect: Statement II is correct
3. Statement I is correct: Statement II is correct
4. Statement I is incorrect: Statement II is incorrect

51.

The first heart sound is heard during:

1.	beginning of ventricular systole
2.	end of ventricular systole
3.	atrial systole
4.	ventricular ejection

52.

Match the Column I and Column II:

	Column I		Column II
(a)	P-waves	(i)	Depolarisation of ventricles
(b)	QRS complex	(ii)	Repolarisation of ventricles
(c)	T-wave	(iii)	Coronary ischemia
(d)	Reduction in the size of T-wave	(iv)	Depolarisation of atria
		(v)	Repolarisation of atria

Select the correct option:

Options:	(a)	(b)	(c)	(d)
1.	(ii)	(iii)	(v)	(iv)
2.	(iv)	(i)	(ii)	(iii)
3.	(iv)	(i)	(ii)	(v)
4.	(ii)	(i)	(v)	(iii)

53. What is the difference between a heart attack and heart failure?

1.	A heart attack is a chronic condition where the heart is unable to pump sufficiently; heart failure is an acute event caused by blockage.
2.	A heart attack results from the blockage of coronary arteries; heart failure is a condition where the heart can't pump blood effectively.
3.	Heart failure is always caused by a heart attack.
4.	Heart attacks and heart failures are different terms for the same condition.

54. Figure shows blood circulation in humans with labels A to D. Select the option which gives correct identification of label and functions of the part:

1.	B - Capillary - thin without muscle layers and wall two-cell layer thick
2.	C - Vein - thin-walled and blood flows in jerks/spurts
3.	D - Pulmonary vein - takes oxygenated blood to heart PO₂=95 mm Hg
4.	A - Artery- thick-walled and blood flows evenly

55. In ABO system, blood group ‘O’ is known as the universal donor because:

I:	No antigens are present on RBCs
II:	No antibodies are present in the plasma

1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect

56. Semilunar valves:

I:	allow the flow of blood from ventricles to the pulmonary artery or aorta.
II:	prevent any backward flow of blood from the pulmonary artery or aorta into the ventricles.

1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect

57. The deficiency of which of the following ions is most likely to adversely affect the process of blood clotting?

1.	Calcium	2.	Iron
3.	Sodium	4.	Potassium

58. During the cardiac cycle:

1.	The atrioventricular valves open during systole
2.	The ventricles contract during diastole
3.	The semilunar valves open during ventricular systole
4.	Atrial systole occurs simultaneously with ventricular systole

59. Consider the given two statements:

I:	SA node is the natural pacemaker of the human heart.
II:	SA node is the only part of that nodal musculature that is auto-excitable.

1.	Only I is correct
2.	Only II is correct
3.	Both I and II are correct
4.	Both I and II are incorrect

60.

Persons with AB blood type can:

1.	donate blood to persons with all blood types as neither A nor B antigens are present on their RBCs
2.	receive blood from persons with all blood types as both A and B antigens are present on their RBCs
3.	receive blood from persons with all blood types as neither A nor B antigens are present on their RBCs
4.	receive blood from persons with all blood types as neither anti-A nor anti-B antibodies are present on his blood plasma

61. What causes the first heart sound (lub) during a heartbeat?

1.	Closure of the semilunar valves at the start of ventricular diastole
2.	Opening of the semilunar valves to allow blood flow to the arteries
3.	Rapid filling of the ventricles from the atria
4.	Closure of the tricuspid and bicuspid valves during ventricular systole

62. Identify the correct statements:

I:	Humans have a closed circulatory system.
II:	Arthropods have an open circulatory system.

1. Only I
2. Only II
3. Both I and II
4. Neither I nor II

63. Following are the stages of pathway for conduction of an action potential through the heart:

A.	AV bundle	B.	Purkinje fibres
C.	AV node	D.	Bundle branches
E.	SA node

Choose the correct sequence of pathway from the options given below:

1.	A-E-C-B-D	2.	B-D-E-C-A
3.	E-A-D-B-C	4.	E-C-A-D-B

64. A cardiovascular centre that can moderate the cardiac function through the autonomic neural system is located in the:

1.	Pons varoli	2.	Medulla oblongata
3.	Hypothalamus	4.	Cerebrum

65. Arrange the following formed elements in the decreasing order of their abundance in blood in humans :

(a)	Platelets	(b)	Neutrophils
(c)	Erythrocytes	(d)	Eosinophils
(e)	Monocytes

Choose the most appropriate answer from the options given below:

1.	(c), (a), (b), (e), (d)	2.	(c), (b), (a), (e), (d)
3.	(d), (e), (b), (a), (c)	4.	(a), (c), (b), (d), (e)

66. What blood vessel is indicated by the arrow in the given figure?

1. Aorta
2. Pulmonary trunk
3. Superior vena cava
4. Coronary sinus

67.

Figure shows a schematic plan of blood circulation in humans with labels A to D. Identify the label and give its function/s.

1.	B-Pulmonary artery- takes blood from heart to lungs, PO₂ = 90mm Hg
2.	C-Vena Cava- takes blood from body parts to right auricle, PCO₂ = 45mm Hg
3.	D-Dorsal aorta- takes blood from heart to body parts, PO₂ = 95mm Hg
4.	A- Pulmonary vein - takes impure blood from body parts, PO₂ = 60mm Hg

68. The primary difference between an artery and a vein is that:

A:	Arteries carry blood away from the heart, and veins carry blood towards the heart.
B:	Veins contain valves, whereas arteries do not.
C:	Arteries carry only oxygenated blood, while veins carry only deoxygenated blood.

1. A and B are correct
2. B and C are correct
3. A and C are correct
4. A, B and C are correct

69.

Assertion(A):	Left ventricle pumps more blood than the right ventricle
Reason(R):	Left ventricle pumps deoxygenated blood and the right ventricle pumps oxygenated blood.

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	(A) is False but (R) is False.

70.

A certain road accident patient with an unknown blood group needs an immediate blood transfusion. His one doctor friend at once offers his blood. What was the blood group of the donor?

1.	Blood group B	2.	Blood group AB
3.	Blood group O	4.	Blood group A

71. The clotting of blood is initiated by:

1.	The exposure of thrombokinase leading to formation of the prothrombin activator complex.
2.	The release of heparin.
3.	The destruction of red blood cells.
4.	The activation of the complement system.

72. If an Rh –ve mother is carrying an Rh +ve foetus, she is likely to be exposed to the Rh antigen:
1. At the time of implantation of the blastocyst
2. At the time when the placenta becomes functional
3. When the first movements of the baby can be felt
4. At the time of delivery

73. Identify the correct statements:

I:	pulmonary arteries carry oxygen-poor blood
II:	pulmonary veins carry blood towards the lung capillaries
III:	blood returning to the left atrium of the heart is oxygen-poor
IV:	oxygen from the blood diffuses into the air sacs (alveoli) of the lungs

1. Only I
2. Only I and III
3. I, II, III and IV
4. Only II and III

74. A person with type O blood group can receive blood from a person with:

1.	type A and type B blood group
2.	type A, type B and type O blood group
3.	type O blood group only
4.	type AB blood group only

75. Regarding erythroblastosis fetalis:

I:	The baby is Rh positive and the mother is Rh negative.
II:	The mother's immune system has made antibodies against the Rh factor present on the red blood cells of the previous baby.
III:	Anaemia and jaundice in a baby are rare.
IV:	There is no mechanism to prevent its occurrence.

1. I, II, III and IV are correct
2. Only I and II are correct
3. Only III and IV are correct
4. Only I is correct

76. An enzyme complex required to initiate the process of coagulation or clotting in response to an injury or trauma is:
1. Plasmin
2. Fibrinolysis
3. Thrombokinase
4. Streptokinase

77. In a cardiac cycle, joint diastole state correctly means:

1.	only the two atria are in a relaxed state
2.	only the two ventricles are in a relaxed state
3.	ventricles and atria are in a relaxed state
4.	only the left atrium and the left ventricle are in a relaxed state

78. Which component of an ECG represents ventricular depolarization, which is necessary for the ventricles to contract?
1. P wave
2. QRS complex
3. T wave
4. U wave

79.

Which WBC has a large kidney-shaped nucleus, does not have granules in the cytoplasm, and after differentiation performs phagocytosis?
1. Neutrophil
2. Basophil
3. Lymphocyte
4. Monocyte

80. Consider the two given statements:

I:	Pulmonary circulation carries deoxygenated blood to the lungs and brings oxygenated blood back to the heart.
II:	The systemic circulation provides nutrients, oxygen and other essential substances to the tissues and takes carbon dioxide and other harmful substances away for elimination.

1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect

81. The clotting of blood is an important function attributed in human blood to:
1. Erythrocytes
2. Leukocytes
3. Thrombocytes
4. Neutrophils

82.

Match the items given in Column-I with those in Column-II and select the correct option given below:

	Column-I		Column-II
a.	Fibrinogen	i.	Osmotic balance
b.	Globulin	ii.	Blood clotting
c.	Albumin	iii.	Defense mechanism

	a	b	c
1.	iii	ii	i
2.	i	ii	iii
3.	i	iii	ii
4.	ii	iii	i

83. A person does not have megakaryocytes. This person:

1.	will not be able to make white blood cells
2.	will not be able to make red blood cells
3.	will have a reduced ability to prevent blood loss
4.	will not be able to defend against bacteria

84.

What would be the heart rate of a person if the cardiac output is 5L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL?
1. 125 beats per minute
2. 50 beats per minute
3. 75 beats per minute
4. 100 beats per minute

85. Consider the given two statements

Statement I:	Lymph is a colourless fluid containing specialized lymphocytes which are responsible for the immune responses of the body.
Statement II:	Lymph carries oxygen and nutrients to the tissues.

1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect

86. The human heart:

1.	is derived from embryonic endoderm.
2.	is situated in the thoracic cavity, in between the two lungs.
3.	has the size and shape of a baseball.
4.	is protected by a single walled membranous bag, pericardium.

87. The sinoatrial node (SAN) in the human heart is present in:
1. the right upper corner of the right atrium.
2. the right atrium near the base of inter-atrial septum.
3. the left lower corner of the left atrium.
3. the left atrium near the base of inter-atrial septum.

88. What does the 'P' wave in an ECG represent?
1. Ventricular depolarization
2. Atrial repolarization
3. Ventricular repolarization
4. Atrial depolarization

89. Consider the two statements:

Assertion (A):	Adrenal medullary hormones can increase the cardiac output.
Reason (R):	Adrenal medullary hormones are steroids with prominent effects on osmoregulation and glucose homeostasis in human body.

1.	Both (A) and (R) are True and (R) correctly explains (A).
2.	(A) is True but (R) is False.
3.	Both (A) and (R) are True but (R) does not correctly explain (A).
4.	(A) is False but (R) is True.

90. The cell shown in the given diagram:

1.	is a bone marrow stem cells committed to produce RBCs
2.	is the megakaryocyte
3.	is the commonest WBC and is phagocytic
4.	is responsible for acquired immunity in humans

Fill OMR Sheet*

*If above link doesn't work, please go to test link from where you got the pdf and fill OMR from there

CLICK HERE to get FREE ACCESS for 2 days of ANY NEETprep course

Please be patient as the PDF generation may take up to a minute.

Fill OMR Sheet*