A heart has some special structural design to act as a pump. It has _________ which contracts and relaxes rhythmically to produce pump-like action.

1 atrium and 3 ventricles

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2 atria and 2 ventricles

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3 atria and 1 ventricle

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1 atrium and 2 ventricles

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Solution

The correct option is B
2 atria and 2 ventricles

The heart has four chambers, 2 atria and 2 ventricles which contract and relax in a rhythmic manner to impart pump-like action. The four chambers are isolated from each other by muscular walls and valves which prevent backflow of blood and mixing of oxygenated blood with deoxygenated blood. The heart is made of involuntary muscles, which means that the functioning of these muscles is not under our control. The heart works continuously day and night without any rest, and this is what keeps us alive.

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Similar questions

A heart has some special structural design to act as a pump. It has ____ which contracts and relaxes rhythmically to produce pump-like action.

Q. Which chamber of the heart has the thickest wall?
(a) Right atrium
(b) Left atrium
(c) Left ventricle
(d) Right ventricle

Blood is pumped from the heart to the entire body by the :
(a) lungs
(b) ventricles
(c) atria
(d) nerves

Q. Assertion :Atria act as primer pumps that increase the ventricular pumping. Reason: About 80 percent of the blood flows directly through the atria into ventricles.

Question 17
Which of the following statement(s) is/are true about the heart?

(i) Left atrium receives oxygenated blood from different parts of the body while right atrium receives deoxygenated blood from lungs.

(ii) Left ventricle pumps oxygenated blood to different body parts while right ventricle pumps deoxygenated blood to lungs.

(iii) Left atrium transfers oxygenated blood to right ventricle which sends it to different body parts.

(iv) Right atrium receives deoxygenated blood from different parts of the body while left ventricle pumps oxygenated blood to different parts of the body.

(a) (i)
(b) (ii)
(c) (ii) and (iv)
(d) (i) and (iii)

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