Question

The walls of ventricles are much thicker than atria. Explain

Answer 1

Human heart:

$\bullet$ In human heart, the walls of the ventricle are much thicker than the atrium because the ventricles have to generate higher pressure so that deoxygenated blood reaches the lungs (in case of right ventricle) and oxygenated blood reaches to all the body parts (in case of left ventricle).

$\bullet$ Thus walls of ventricles are more muscular than the walls of atria, as ventricles have to generate greater force

$\bullet$ The walls of the atria are relatively thin, as they are the upper chambers and they just have to pump blood below into the ventricles of the heart.