The normal pacemaker of the human heart, sinoatrial node, is derived from the more primitive:
1. ventricle

2. bundle of His

3. conus arteriosus

4. sinus venosus

Subtopic:  Human Heart: Gross Anatomy |
 55%
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NEET 2023 - Target Batch - Aryan Raj Singh
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Amongst the following, a molecule that would lead to coagulation of the blood would be:
1. prostacyclin
2. tissue factor or thromboplastin
3. plasmin
4. tissue plasminogen activator

Subtopic:  Blood: Blood Clotting |
 87%
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NEET 2023 - Target Batch - Aryan Raj Singh
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During a cardiac cycle:
1. About 70 ml of blood is pumped by the two ventricles
2. The left atrium and the left ventricle contract simultaneously
3. More blood is pumped into the systemic than in pulmonary circulation
4. The atria contract prior to the ventricles

Subtopic:  Human Heart: Cardiac Cycle |
 57%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

Erythroblastosis fetalis can be prevented during a second pregnancy in a Rh negative mother who is likely to carry a Rh positive fetus by:

1. Administering anti – Rh antibodies to the mother just before the delivery of the second child
2. Administering Rh antigen to the mother just after the delivery of the first child
3. Administering Rh antigen to the mother just before the delivery of the second child
4. Administering anti – Rh antibodies to the mother just after the delivery of the first child
Subtopic:  Blood: Blood Group |
 72%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

Which of the following have no nuclei and originate as pinched-off cytoplasmic fragments of large cells in the bone marrow?
1. Mature RBC
2. Reticulocytes
3. Thrombocytes
4. Macrophages

Subtopic:  Blood: White Blood Cells |
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NEET 2023 - Target Batch - Aryan Raj Singh
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Aging RBCs are phagocytized by macrophages in the mononuclear phagocyte system [sleen or liver] and their components are recycled, EXCEPT for the

1. iron atom from the heme group, which is excreted in bile

2. globin peptide chains, which are sent to the kidneys for excretion

3. globin peptide chains, which are converted into bilirubin

4. heme group (minus the iron atom), which is converted into a green pigment called biliverdin

Subtopic:  Blood: General Description & RBC: Part 1 | Blood: General Description & RBC |
 51%
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NEET 2023 - Target Batch - Aryan Raj Singh
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Erythroblastosis fetalis condition arises when a:

1. Rh (+) female carries a Rh(–) foetus for the
first time.

2. Rh (+) female carries a Rh(–) foetus for the
second time.

3. Rh (–) female carries a Rh (+) foetus for the
first time.

4. Rh (–) female carries a Rh (+) foetus for the
second time.

Subtopic:  Blood: Blood Group |
 62%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

Which of the following statements is not correct about
ECG?

1. P wave represents atrial depolarisation.

2. QRS wave initiates ventricular contraction.

3. The end of T wave marks the end of ventricular
systole.

4. Q wave marks the beginning of atrial systole.

Subtopic:  ECG & Coronary Artery Disease |
 79%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

Assertion: Right atrium and right ventricle of heart are known as pulmonary heart.

Reason: Both right atrium and ventricle pump the deoxygenated blood.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Human Heart: Double Circulation |
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NEET 2023 - Target Batch - Aryan Raj Singh
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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

Subtopic:  Human Heart: Cardiac Cycle |
 59%
From NCERT
NEET - 2019
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NEET 2023 - Target Batch - Aryan Raj Singh