_______ are present in the heart to prevent backflow of blood within the chambers.

Arteries

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Veins

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Valves

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Capillaries

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Solution

The correct option is C
Valves

Valves prevent backflow of blood from ventricles to atria when ventricles contract and from the blood vessels to the ventricles when the ventricles relax. Valves are also present in the veins to prevent the backflow of blood and ensure blood flow only towards the heart.

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Similar questions

Q. Assertion: Valves are present in veins.
Reason: Valves prevent the backflow of blood in veins.

Valves are present to prevent backflow of blood in the heart.

Complete the following statements by filling in the blanks from the choices given in the bracket.
(a) The blood vessel that begins and ends in capillaries is the ... (hepatic artery. Hepatic portal vein, hepatic vein)
(b) A blood vessel which has a small lumen and thick walls is (capillary, lymphatic duct, artery, venule)
(c) the valve which prevents backflow of blood in the veins and lymph vessels... (mitral valve, tricuspid valve, semilunar valve).

Q. Choose the correct statements :
I. The heart is a hollow organ present in the thoracic cavity
II. The pulmonary veins are guarded by valves which prevent the backflow of blood.
III. The walls of the left ventricle are about three times thicker than the right ventricle.
IV. Pulmonary arteries carry deoxygenated blood to the lungs
V. The foetal heart has an opening between two atria

Veins have valves to prevent the backflow of blood because the blood in veins flow ________.

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