ANATOMY

Detailed explanation-1: -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.

Detailed explanation-2: -Blood from the vena cava enters the right atrium. Blood from the atria flow into their respective ventricles. A blood clot in the left leg would first enter the venous system to drain back towards the heart, first encountering the vena cava.

Detailed explanation-3: -Oxygen-poor blood from all over your body enters your right atrium through two large veins, your inferior vena cava and superior vena cava. Your tricuspid valve opens to let blood travel from your right atrium to your right ventricle.

Detailed explanation-4: -the correct answer is 3. vena cava-right atrium-right ventricle-lungs-left atrium-left ventricle-aorta .