Human Heart & Circulation — NEET Biology MCQs with Solutions
Free NEET Biology Human Heart & Circulation MCQs with step-by-step solutions (96 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.
Q7 — Human Heart & Circulation · easy · numerical
Blood returning from the body tissues enters the human heart first at the:
A. Right atrium via the superior and inferior venae cavae ✓ Correct
B. Right ventricle via the pulmonary artery
C. Left atrium via the pulmonary veins
D. Left ventricle via the aorta
Solution: Deoxygenated systemic blood returns through the venae cavae into the right atrium. The pulmonary veins carry oxygenated blood into the left atrium.
Q8 — Human Heart & Circulation · easy · numerical
The correct sequence of the cardiac impulse-conducting pathway is:
A. SAN → AVN → bundle of His → bundle branches → Purkinje fibres ✓ Correct
B. Bundle of His → SAN → AVN → Purkinje fibres
C. AVN → SAN → Purkinje fibres → bundle of His
D. Purkinje fibres → bundle branches → AVN → SAN
Solution: The impulse originates at the SAN (pacemaker), passes to the AVN, then along the bundle of His and its branches, and finally through the Purkinje fibres to the ventricular muscle.
Q9 — Human Heart & Circulation · easy · numerical
The term "double circulation" in humans specifically means that:
A. The heart has two chambers that beat alternately
B. There are two hearts working in parallel
C. Blood passes through the heart twice to complete one full body circuit ✓ Correct
D. Blood flows in two directions within the same vessel
Solution: In double circulation blood travels through the heart twice per complete circuit — once via the pulmonary loop and once via the systemic loop — keeping oxygenated and deoxygenated streams separate.
Q10 — Human Heart & Circulation · easy · numerical
The left atrioventricular valve of the human heart, guarding the opening between the left atrium and left ventricle, is the:
A. Pulmonary semilunar valve
B. Aortic semilunar valve
C. Bicuspid (mitral) valve ✓ Correct
D. Tricuspid valve
Solution: The left AV valve has two cusps and is the bicuspid or mitral valve; the tricuspid (three cusps) guards the right AV opening.
Q11 — Human Heart & Circulation · medium · numerical
The heart muscle itself is supplied with oxygenated blood by the coronary arteries, which arise from the:
A. Base of the aorta, just above the aortic semilunar valve ✓ Correct
B. Pulmonary artery leaving the right ventricle
C. Superior vena cava entering the right atrium
D. Pulmonary veins entering the left atrium
Solution: The coronary arteries branch from the root of the aorta near the aortic valve, delivering oxygen-rich blood to the myocardium. The pulmonary artery carries deoxygenated blood.
Q12 — Human Heart & Circulation · medium · numerical
Which of the following statements about the hepatic portal system is correct?
A. It drains blood from the lungs into the left ventricle
B. It carries oxygenated blood directly from the aorta to the intestine
C. It connects the two atria of the heart during foetal life
D. The hepatic portal vein carries blood from the intestine to the liver before it returns to the heart ✓ Correct
Solution: The hepatic portal system is a special vein routing nutrient-rich blood from the digestive tract to the liver first, rather than straight back to the heart, allowing the liver to process absorbed materials.
Q13 — Human Heart & Circulation · medium · numerical
Assertion (A): The wall of the left ventricle is thicker than that of the right ventricle. Reason (R): The left ventricle pumps blood at higher pressure into the systemic circulation reaching the whole body. Choose the correct option.
A. Both A and R are true but R is not the correct explanation of A
B. A is false but R is true
C. A is true but R is false
D. Both A and R are true and R is the correct explanation of A ✓ Correct
Solution: The left ventricle must generate high pressure to drive blood through the entire systemic circuit, so its muscular wall is thicker — R correctly explains A.
Q14 — Human Heart & Circulation · medium · numerical
Match each vessel with the blood it carries and choose the correct set: (i) Pulmonary artery (ii) Pulmonary vein (iii) Aorta — (p) oxygenated blood to the body (q) deoxygenated blood to the lungs (r) oxygenated blood to the heart.
A. i-q, ii-r, iii-p ✓ Correct
B. i-p, ii-q, iii-r
C. i-r, ii-p, iii-q
D. i-q, ii-p, iii-r
Solution: The pulmonary artery carries deoxygenated blood to the lungs, the pulmonary vein returns oxygenated blood to the heart, and the aorta distributes oxygenated blood to the body.
Q15 — Human Heart & Circulation · medium · numerical
A structural feature that prevents the atrioventricular valves from turning inside out (prolapsing) into the atria during ventricular contraction is the:
A. Sino-atrial node in the right atrial wall
B. Interventricular septum separating the ventricles
C. Chordae tendineae anchoring the valve cusps to papillary muscles ✓ Correct
D. Semilunar valves at the base of the aorta
Solution: The chordae tendineae attach the AV valve cusps to the papillary muscles of the ventricle wall, holding them in place so they do not flip back into the atria under ventricular pressure.
Q16 — Human Heart & Circulation · medium · numerical
Trace one water molecule of plasma starting in the right ventricle. Which ordered route does it follow next?
A. Right ventricle → left ventricle → aorta → lungs
B. Right ventricle → pulmonary artery → lungs → pulmonary vein → left atrium ✓ Correct
C. Right ventricle → pulmonary vein → lungs → pulmonary artery → left atrium
D. Right ventricle → aorta → body → vena cava → right atrium
Solution: From the right ventricle blood is pumped through the pulmonary artery to the lungs for oxygenation, then returns via the pulmonary vein to the left atrium — the pulmonary circuit.
Q17 — Human Heart & Circulation · easy
Open circulatory system is found in
A. Arthropods and Molluscs ✓ Correct
B. Annelids and Chordates
C. Fishes and Molluscs
D. Annelids and Arthropods
Solution: Open circulation, where blood bathes tissues in sinuses, occurs in arthropods and molluscs.
Q18 — Human Heart & Circulation · easy
Closed circulatory system is found in
A. Arthropod and Chordates
B. Amphibians and Molluscs
C. Molluscs and Chordates
D. Annelids and Chordates ✓ Correct
Solution: Closed circulation, where blood flows within vessels, occurs in annelids and chordates.
Q19 — Human Heart & Circulation · medium
In an open circulatory system
A. there is no distinction between blood and tissue fluid ✓ Correct
B. there is no need of blood vessels
C. there is no heart
D. there are no open spaces or sinuses in the body
Solution: In an open system blood is pumped into open sinuses and mixes with tissue fluid, so there is no distinction between blood and tissue fluid (haemolymph).
Q20 — Human Heart & Circulation · medium
Advantages of closed circulatory system over open circulatory system includes which of the following?
(1) Closed system can direct blood to specific tissues
(2) Exchange occurs more rapidly
(3) Closed circulatory system can support higher levels of metabolic activity
A. Exchange occurs more rapidly
B. Closed circulatory system can support higher levels of metabolic activity
C. Closed system can direct blood to specific tissues
D. All ✓ Correct
Solution: A closed system offers all these advantages: precise blood distribution, rapid exchange and support for higher metabolism.
Q21 — Human Heart & Circulation · medium
Which of the following statements is wrong about the closed circulatory system?
A. In it flow of fluid can be more precisely regulated
B. There is no blood capillary ✓ Correct
C. Blood remains within blood vessels and never comes in direct contact with the body cells
D. Blood flow is more rapid due to higher pressure
Solution: It is wrong to say there is no blood capillary; a closed system has capillaries where exchange occurs.
Q22 — Human Heart & Circulation · medium
Following are figures of hearts in different animals (A = Auricle, V = Ventricle). Identify the animals matching the characteristic hearts labelled I, II, III and IV.
A. Fishes, Reptiles, All reptiles, Birds/Mammals
B. Fishes, Birds, Reptiles/birds, Mammal
C. Fishes, Amphibians, Reptiles, Crocodiles/Birds/Mammals ✓ Correct
D. Fishes, Crocodiles, Amphibians/Reptiles, Birds/Mammals
Solution: Fishes have a two-chambered heart, amphibians three-chambered, most reptiles three-chambered (incomplete), and crocodiles, birds and mammals four-chambered.
Q23 — Human Heart & Circulation · easy
In fishes, the blood circulation passes through the heart only once per complete circuit. The above flow of blood indicates it is a
A. Single circulation ✓ Correct
B. Incomplete double circulation
C. Double circulation
D. Incomplete single circulation
Solution: In fishes blood passes through the heart only once per cycle (heart to gills to body), which is single circulation.
Q24 — Human Heart & Circulation · medium
Incomplete double circulation is found in which of the following animals?
A. Birds and Mammals
B. Birds
C. Amphibians and Reptiles ✓ Correct
D. Mammals
Solution: Amphibians and reptiles have a three-chambered heart (except crocodiles) where oxygenated and deoxygenated blood mix, giving incomplete double circulation.
Q25 — Human Heart & Circulation · easy
Which of the following statements is not true?
A. Heart is ectodermal in origin ✓ Correct
B. Double wall membranous bag (pericardium) with pericardial fluid protects heart
C. Human heart has the size of a clenched fist.
D. In human beings heart is situated in the thoracic cavity, in between the two lungs slightly tilted to the left
Solution: The heart develops from mesoderm, not ectoderm, so this statement is false.
Q26 — Human Heart & Circulation · easy
Which of the following is correct about human heart?
A. Ventricles are upper chambers and atria are lower chambers in our heart
B. The volume of both atria > the volume of both ventricles
C. The volume of both atria = the volume of both ventricles
D. The volume of both ventricle > the volume of both atria ✓ Correct
Solution: Ventricles are larger, thicker-walled pumping chambers, so their combined volume exceeds that of the atria.
Q27 — Human Heart & Circulation · easy
Bicuspid valve / mitral valve is found between
A. Left atrium and right ventricle
B. Right atrium and left ventricle
C. Left atrium and left ventricle ✓ Correct
D. Right atrium and right ventricle
Solution: The bicuspid (mitral) valve guards the opening between the left atrium and left ventricle.
Q28 — Human Heart & Circulation · easy
Tricuspid valve is present between the
A. Two atria
B. Left atrium and left ventricle
C. Right atrium and right ventricle ✓ Correct
D. Two ventricles
Solution: The tricuspid valve lies between the right atrium and right ventricle.
Q29 — Human Heart & Circulation · easy
Chordae tendinae are found in
A. Ventricles of heart ✓ Correct
B. Atria of heart
C. Ventricles of brain
D. Joints
Solution: Chordae tendinae are tendinous cords in the ventricles that anchor the AV-valve flaps.
Q30 — Human Heart & Circulation · easy
Ventricles are thick-walled as compared to atrium because
A. None
B. It is present on the posterior side
C. It is to receive blood from atria
D. It is to pump blood ✓ Correct
Solution: Ventricles have thick muscular walls to generate the force needed to pump blood out of the heart.