Question

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what is the function of venous valves?
a they regulate blood flow into the tissue capillaries.
b they help keep the blood flowing toward the heart.
c they carry oxygenated blood from the left ventricle to the body tissues.
d they transport blood from the lungs to the left atrium.

Explanation:

Venous valves prevent the back - flow of blood in veins and ensure that blood moves towards the heart due to the lower pressure in the heart compared to veins. They are crucial in maintaining one - way blood flow in the venous system.

Answer:

B. They help keep the blood flowing toward the heart.