Question

multiple choice question
the functions of the atria require them to have a ______ wall than the ventricles.
thinner
thicker

Explanation:

The atria receive blood and pump it a short distance to the ventricles. The ventricles, especially the left ventricle, need to pump blood to the entire body (for the left ventricle) or the lungs (for the right ventricle). Since the ventricles have a more force - requiring pumping task (higher pressure generation), they have thicker muscular walls. The atria, with their less force - demanding function of just filling the ventricles, have thinner walls.

Answer:

thinner