Answer: Option A
:
A
All blood enters the right side of the heart through two veins: The superior vena cava (SVC) and the inferior vena cava(IVC). The SVC collects blood from the upper half of the body. The IVC collects blood from the lower half of the body. Blood leaves the SVC and the IVC and enters the right atrium (RA). When the RA contracts, the blood goes through the tricuspid valve and into the right ventricle (RV). When the RV contracts, blood is pumped through the pulmonary valve, into the pulmonary artery (PA) and into the lungs where it picks up oxygen. Blood now returns to the heart from the lungs by way of the pulmonary veins and goes into the left atrium (LA). When the LA contracts, blood travels through the mitral valve and into the left ventricle (LV). The LV is a very important chamber that pumps blood through the aortic valve and into the aorta. The aorta is the main artery of the body. It receives all the blood that the heart has pumped out and distributes it to the rest of the body.