AP BIOLOGY

Detailed explanation-1: -Your valves ensure that blood flows only in one direction. These valves are: Aortic valve connects your left ventricle and aorta (large artery that carries blood throughout your body). Mitral valve connects your left atrium and left ventricle.

Detailed explanation-2: -Heart valves control the flow of blood so that it moves in the right direction. The valves prevent blood from flowing backward. The heart has four valves. The tricuspid valve separates the right atrium and right ventricle.

Detailed explanation-3: -The two semilunar, one-way valves are made up of three flaps, each composed of connective tissues and endocardium as well as fibers to prevent the valves from flapping inside out. Their shapes are like a half moon and thus they are called the semilunar (SL) aortic valve and SL pulmonary valve.

Detailed explanation-4: -Blood passes through a valve before leaving each chamber of the heart. The valves prevent the backward flow of blood. Valves are actually flaps (leaflets) that act as one-way inlets for blood coming into a ventricle and one-way outlets for blood leaving a ventricle.

Detailed explanation-5: -The valves open and close to help blood move along its path: Blood that needs oxygen flows from your body into the right atrium. It then flows through the tricuspid valve to the right ventricle. The right ventricle pumps the blood through the pulmonary valve and into your lungs, where it picks up oxygen.