THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The bottom 2 chambers are called the right and left ventricles. Each of these chambers has a valve that keeps blood flowing in 1 direction.

Detailed explanation-2: -The heart is made up of four chambers. The upper two chambers are called atria (singular: atrium) and the lower two are known as ventricles (singular: ventricle).

Detailed explanation-3: -The lower chambers of the heart are called ventricles.

Detailed explanation-4: -What are heart valves? The heart has 4 chambers, 2 upper chambers (atria) and 2 lower chambers (ventricles). Blood passes through a valve before leaving each chamber of the heart. The valves prevent the backward flow of blood.