The walls of the ventricles are ___________ than atrial walls.

Correct option is D

The correct answer is (d) thicker

Explanation:

·       The ventricles pump blood to distant organs, requiring greater force and hence thicker muscular walls.

·       The left ventricle, especially, has the thickest wall to pump oxygenated blood to the entire body through the aorta.

·       Atria only receive blood and pump it into the ventricles, so they do not need thick walls.

·       Thick ventricular walls help maintain the high pressure needed for effective circulation.

·       This anatomical difference is essential for the dual circulatory system in humans.

Information Booster:

·       The thickness of the left ventricular wall is approximately 8–15 mm, while the right is about 3–5 mm.

·       Atrial walls are usually 1–2 mm thick.

Additional Knowledge:

thinner (Option a)

·       Incorrect — atrial walls are thinner, not ventricular.

larger (Option b)

·       Vague term — wall thickness is being compared, not chamber volume.

smaller (Option c)

·       Also incorrect — again, the context is wall thickness, not size.