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

4 chambers: 1 atrium and 3 ventricles

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4 chambers: 2 atria and 2 ventricles

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4 chambers: 3 atria and 1 ventricle

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3 chambers: 1 atrium and 2 ventricles

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Solution

The correct option is B
4 chambers: 2 atria and 2 ventricles

The heart has 4 chambers: 2 atria and 2 ventricles which contract and relax in a rhythmic manner to impart pump-like action. The 4 chambers are isolated from each other by muscular walls and valves which prevent backflow of blood and mixing of oxygen-rich blood with carbon dioxide rich 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

Assertion[A]: Atria and ventricles do not contract at the same time.

Reason[R]: This time delay allows proper filling of all the 4 chambers of the heart and results in an efficient pumping of blood.

Q. Match the following chambers of the heart with the respective blood vessels:

	Column A		Column B
$1.$	Right atrium	$a .$	Pulmonary vein
$2.$	Left atrium	$b .$	Aorta
$3.$	Right ventricle	$c .$	Superior vena cava
$4.$	Left ventricle	$d .$	Pulmonary artery

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

The upper chambers of the heart which pump blood into the ventricles are called

The upper chambers of heart which pump blood into the ventricles are called ________. Choose the correct option.

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