Complete the passage to describe the function of the heart. The pumping of the heart involves the alternate contraction and relaxation of the chambers of the heart. The upper chambers of the heart are called , and the lower chambers of the heart are called .

upper chambers of heart are called auricles or atria

lower chambers are called ventricles

Hii!! The correct answers are atria and ventricles. (:

Atrium

Ventricles

Explanation:

The upper chambers of the heart are called atrium whereas the lower chambers are called ventricles.

The heart is at the center of the circulatory system which moves blood round the body.

At the atrium, blood returning from the lungs and body parts fills up this part of the heart. It is divided into a left and right atrium. The ventricles pumps blood out of the heart into the body parts and lungs. It has a thicker wall.

Im pretty sure your answer is b.