Question 16

Left ventricle has the thickest wall of the heart.

The left ventricle possesses the thickest wall among the heart's cavities due to its critical role in pumping oxygenated blood to the entire body, requiring greater muscular strength compared to the other chambers.

A) Right atrium

The right atrium has a relatively thin wall as its primary function is to receive deoxygenated blood from the body and direct it to the right ventricle. The pressure it handles is much lower than that of the left ventricle, making it less muscularly developed.

B) Left atrium

While the left atrium has a thicker wall than the right atrium, it is still not as thick as the left ventricle. Its role is to receive oxygenated blood from the lungs and push it into the left ventricle, which does not require as much muscular force as the left ventricle's pumping action.

C) Right ventricle

The right ventricle has a thicker wall than the right atrium, but it is considerably thinner than the left ventricle. It pumps deoxygenated blood to the lungs, which requires less pressure compared to the left ventricle's function of distributing blood throughout the body.

D) Left ventricle

The left ventricle has the thickest wall of all heart chambers, as it must generate sufficient pressure to pump oxygen-rich blood through the aorta to the entire systemic circulation. This thick muscular wall is essential for overcoming the higher resistance encountered in the body.

Conclusion

The left ventricle's role in systemic circulation necessitates a robust muscular structure, making it the chamber with the thickest wall. In contrast, the other options—right atrium, left atrium, and right ventricle—have thinner walls suited to their less forceful pumping requirements, confirming that D is the correct answer.