Question

What stops blood from flowing backwards through

The blood leaving the tissues becomes richer in a
component. Name it.
When the right atrium contracts, blood flows from
it to which part of the heart?

What is the systolic and diastolic pressure of a
normal man?
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Answer 1

Answer:

The aortic and pulmonic valves close, preventing backward blood flow into the heart. The mitral and tricuspid valves then open to allow forward blood flow within the heart to fill the ventricles again.

The blood leaving the tissues becomes richen in CO2. The main artery (aorta) carries oxygenated blood to all the organs of the body from the heart.

Blood passes from the right atrium through the tricuspid valve and into the right ventricle. When the right ventricle contracts, the muscular force pushes blood through the pulmonary semilunar valve into the pulmonary artery.

For a normal reading, your blood pressure needs to show a top number (systolic pressure) that's between 90 and less than 120 and a bottom number (diastolic pressure) that's between 60 and less than 80.

Explanation:

Hope this answer help u

Answer 2

Explanation:

The valves push blood backwards

when right atrium contract it pushes the blood through semilunal valve to the right ventricle