THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The oxygenated blood is brought back to the heart by the pulmonary veins which enter the left atrium. From the left atrium blood flows into the left ventricle. The left ventricle pumps the blood to the aorta which will distribute the oxygenated blood to all parts of the body.

Detailed explanation-2: -The right atrium receives the low-oxygen blood that has just travelled round the body. The right atrium pumps the blood to the right ventricle. The right ventricle pumps the low-oxygen blood to the lungs to pick up a fresh supply of oxygen.

Detailed explanation-3: -The right atrium is the first chamber that receives blood. The chamber expands as its muscles relax to fill with blood that has returned from the body. The blood enters a second, more muscular, chamber called the right ventricle.

Detailed explanation-4: -Blood comes into the right atrium from the body, moves into the right ventricle and is pushed into the pulmonary arteries in the lungs. After picking up oxygen, the blood travels back to the heart through the pulmonary veins into the left atrium, to the left ventricle and out to the body’s tissues through the aorta.