Right atrium
Blood enters the coronary arteries just above the aortic semilunar valve. After systole (a ventricular contraction), the valve closes. The closing valve causes blood to back flow against the valve. At this time, the backward flow of blood enters into the coronary arteries.
Once blood enters the heart it's flow is regulated by the bicuspid and tricuspid valve which connects the atriums to the ventricles.
When blood enters the pulmonary valve of the heart it flows away from it and enters the lungs. As a result, oxygen is picked up by the lings and transferred back through the pulmonary valve to the heart.
it starts with the hear and enters the valve through the atrium
If the mitral valve prolapses, the blood may flow backwards into the left atrium.
Small intestine is where the food enters the blood.
the tricuspid valve
After the right AV valve, the blood flows into the right ventricle.
Damage to the left semilunar valve would interfere with blood flow to the aorta. Damage to the semilunar valve of the right side of the heart would affect the blood flow to the pulmonary artery.
A heart valve stops the flow of blood backwards when the heart muscle pulses. Without the valve there would be no direction to the flow of the blood.
The Tricuspid valve is in the heart, not the feet
After traveling through the body when blood returns to the heart.The blood first enters the right atrium. It then flows through the tricuspid valve into the right ventricle. When the heart beats, the ventricle puts pressure on the blood to push it through the pulmonic valve into the pulmonic artery. Next, the pulmonic artery carries blood to the lungs where it "picks up" oxygen, and leaves the lungs and returns to the heart through the pulmonic vein. The blood enters the left atrium, then descends through the mitral valve, into the left ventricle. The left ventricle then pumps blood through the aortic valve, and into the aorta, it is now pushed to the rest of the body.