HUMAN NUTRITION

Detailed explanation-1: -Thus, valves help the return of blood to the heart-by opening when the blood flows toward the heart and closing when blood might flow backward. The deep veins play a significant role in pushing blood toward the heart. The one-way valves in deep veins prevent blood from flowing backward.

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.

Detailed explanation-3: -Tricuspid valve: This valve has three leaflets. They allow blood to flow from the right atrium to the right ventricle. They also prevent blood from flowing backward from the right ventricle to the right atrium.

Detailed explanation-4: -The one-way valves in deep veins prevent blood from flowing backward. The muscles surrounding the deep veins squeeze the veins, helping force the blood toward the heart, just as squeezing a toothpaste tube ejects toothpaste.

Detailed explanation-5: -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.