The chamber of the human heart with thickest musculature is the:
1. Right atrium
2. Right ventricle
3. Left atrium
4. Left ventricle
A ‘conduction delay’ in the human heart is associated with:
1. SA node
2. AV node
3. Bundle of His
4. Purkinje fibers
During the cardiac cycle, the AV vales close during:
1. Early ventricular systole
2. Late ventricular systole
3. Early ventricular diastole
4. Late ventricular diastole
A chronic condition in which the heart doesn’t pump blood as well as it should is called:
1. Angina pectoris
2. Heart attack
3. Heart failure
4. Heart block
The epithelium lining the alveolus is composed of
1. a simple squamous epithelium.
2. a pseudostratified ciliated columnar epithelium.
3. a simple cuboidal epithelium.
4. a transitional epithelium.
Which of the following factors favors a release of oxygen from hemoglobin?
1. decreased
2. decreased pH
3. lower blood temperature
4. increased pH
The cells that produce the smallest formed elements of the blood are called
1. erythroblasts
2. megakaryocytes
3. myeloblasts
4. thrombocytes
Persons with Rh ____________ blood never exhibit Rh ____________.
1. negative; incompatibility
2. negative; antibodies
3. positive; surface antigens
4. positive; antibodies
In an ECG tracing, what might an unusually strong QRS complex indicate?
1. damage to the sinoatrial node
2. acute coronary ischemia
3. hypertrophy of the ventricular myocardium
4. damage to the AV bundle or Purkinje fibers
What happens during ventricular diastole?
1. both ventricles fill with blood
2. both semilunar valves remain open
3. both AV valves remain closed
4. both ventricles contract
Which structures prevent the AV valves from everting and flipping into the atria when the ventricles contract?
1. chordae tendineae and pectinate muscles
2. chordae tendineae and papillary muscles
3. conus arteriosus and interventricular septum
4. foramen ovale and fossa ovalis
Fill in the blanks with appropriate letters from the given diagram and choose the correct answer from the options given: ____ pumps oxygenated blood into ____ and ______ prevents its backflow into ______.
1. m, j, d, f
2. f, j, d, f
3. m, h, n, m
4. f, h, d, m
Which part of the specialized conducting system of the human heart is auto-excitable?
I. | SA Node | II. | AV node |
III. | AV bundle | IV. | Purkinje fibers |
1. I and II only
2. I, II and III only
3. II, III and IV only
4. I, II, III and IV
Which among the following is correct during each cardiac cycle?
1. The volume of blood pumped out by the Rt and Lt ventricles is same.
2. The volume of blood pumped out by the Rt and Lt ventricles is different
3. The volume of blood received by each atrium is different
4. The volume of blood received by the aorta and pulmonary artery is different
If due to some injury the chordae tendinae of the bicuspid valve of the human heart is partially non-functional, what would be the immediate effect?
1. Heart beat would become irregular
2. Blood will tend to move back into the right atrium.
3. The flow of blood into the aorta will be slowed down.
4. The flow of blood into pulmonary artery will be reduced.
What is the state of heart in the interval after end of second heart sound and before beginning of first heart sound again?
1. Ventricle remain systole auricles undergo first diastole and the systole
2. Ventricle remain in diastole, auricles undergoes first diastole and then systole
3. Ventricles undergo first systole and then diastole, auricles remain in diastole.
4. Ventricles remain in diastole, auricles remain in systole.
Which of the following statements is correct for cardiac cycle?
1. The ventricular systole is stimulated by the SA node.
2. The first heart sound coincides with the closure of semilunar valves and relaxation of ventricles.
3. The blood flows from auricles to ventricles during the atrial systole via bicuspid and tricuspid valves.
4. The fall in ventricular pressure causes the closure of semilunar valve to prevent the back-flow of blood into ventricles.
If type A agglutinogens are present on the surface of RBCs of a person but type B are absent, then what type of agglutinin will be present in the plasma of this person?
1. Anti-A
2. Anti-B
3. Nil
4. Both Anti-A and Anti-B
G-6-P dehydrogenase deficiency is associated with haemolysis of -
1. Leucocytes
2. Lymphocytes
3. Platelets
4. RBCs
Which of the following substances, if introduced into the blood stream, would cause coagulation of blood at the site of its introduction -
1. Thromboplastin
2. Fibrinogen
3. Heparin
4. Prothrombin
The number of correct statements amongst the given statements is:
I. Leucocytes are nucleated, lesser in number and generally short lived.
II. Rh incompatibility becomes significant when an Rh –ve mothers carries an Rh +ve fetus.
III. An enzyme complex, thrombokinase, is required for clot retraction and clot dissolution.
IV. Fats are absorbed through lymph in the lacteals present in the intestinal villi.
V. Heart is derived from the embryonic mesoderm.
1. 2
2. 3
3. 4
4. 5
What is true about the cell shown in the given diagram?
1. It is the rarest WBC found in the blood.
2. It is the largest WBC.
3. Its number is increased in acute bacterial infections.
4. It is involved in the transport of blood gases.
Match each item in Column I with one in Column II and choose your answer from the codes given below:
A. Generation a. AV node of impulse
B. Conduction delay b. SA node
C. Lub c. Closure of semilunar valves
D. Dub d. Closure of AV valves
A. B. C. D.
1. a b c d
2. b a d c
3. a b d c
4. b a c d
Atrial systole increases ventricular filling by about ___ %, Ventricular systole leads to closure of ______ valves and ventricular diastole leads to closure of __________ valves and opening of ______ valves.
1. 30, Atrioventricular, Semilunar, Atrioventricular
2. 70, Atrioventricular, Semilunar, Atrioventricular
3. 30, Semilunar, Atrioventricular, Semilunar
4. 70, Semilunar, Atrioventricular, Semilunar
An increase from pH 7.2 to pH 7.4 around hemoglobin causes:
1. | hemoglobin to release all bound oxygen molecules. |
2. | an increase in the affinity of hemoglobin to bind oxygen molecules. |
3. | hemoglobin to denature. |
4. | an increase in the binding of H+ by hemoglobin. |