Human Heart & Circulation — NEET Biology MCQs with Solutions
Free NEET Biology Human Heart & Circulation MCQs with step-by-step solutions (6 questions). Part of Body Fluids and Circulation. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Human Heart & Circulation · easy · theory
The human heart is ______ chambered, with two atria and two ventricles:
A. Four ✓ Correct
B. Three
C. Five
D. Two
Solution: The human heart has four chambers — two atria (upper) and two ventricles (lower).
Q2 — Human Heart & Circulation · easy · theory
The pacemaker of the heart, which initiates the heartbeat, is the:
A. Atrio-ventricular node
B. Sino-atrial node (SAN) ✓ Correct
C. Bundle of His
D. Purkinje fibres
Solution: The SA node in the right atrium sets the rhythm — hence "pacemaker".
Q3 — Human Heart & Circulation · medium · theory
The valve between the left atrium and left ventricle is the:
A. Tricuspid valve
B. Bicuspid (mitral) valve ✓ Correct
C. Aortic valve
D. Semilunar valve
Solution: The left AV opening has a bicuspid (mitral) valve; the right has a tricuspid valve.
Q4 — Human Heart & Circulation · medium · theory
Double circulation in mammals means blood passes through the heart ______ per complete cycle:
A. Twice (pulmonary + systemic circuits) ✓ Correct
B. Four times
C. Once
D. Three times
Solution: Blood flows heart → lungs → heart (pulmonary) and heart → body → heart (systemic) — passing the heart twice.
Q5 — Human Heart & Circulation · hard · theory
The correct path of the electrical impulse in the heart is:
A. SA node → AV node → bundle of His → Purkinje fibres ✓ Correct
B. Purkinje fibres → SA node → AV node
C. Bundle of His → SA node → AV node
D. AV node → SA node → Purkinje fibres
Solution: The impulse spreads SAN → AVN → bundle of His → its branches → Purkinje fibres, contracting the ventricles.
Q6 — Human Heart & Circulation · hard · theory
The vena cava carries ______ blood to the ______, while the pulmonary vein carries ______ blood to the ______:
A. Deoxygenated; left atrium; oxygenated; right atrium
B. Oxygenated; left atrium; deoxygenated; right atrium
C. Deoxygenated; right atrium; oxygenated; left atrium ✓ Correct
D. Oxygenated; right atrium; deoxygenated; left atrium
Solution: Venae cavae bring deoxygenated blood to the right atrium; pulmonary veins bring oxygenated blood to the left atrium.