Question

The atrial wall is ________, while the ventricular wall is _______.

• A. Thin, thick
• B. Thin, thin
• C. Thick, thin
• D. Thick, thick

Answer 1

Answer: (A)

Thin, thick

• Our heart has four chambers, two relatively small thin-walled upper chambers called atria. These receive oxygenated blood (left atrium) and deoxygenated blood (right atrium). These are the 'receiving chambers'.
• The atria pour the blood received by them into the respective ventricle. Ventricles are thick-walled as they have to pump blood. The right ventricle pumps blood into the pulmonary artery while the left ventricle pumps blood into the aorta.

So, the correct answer is 'thin, thick'.