Question

How do you valves help circulate blood through heart

Answer 1

Valves allow one–way circulation of blood so that it does not flow back.

Step-by-step explanation:

i got it right when i took the test

Answer 2

As the de-saturated blood leaves the right ventricle, it passes through the pulmonary valve, which has been closed as the right ventricle was filling. The pulmonary valve opens, allowing the blood to leave the right ventricle and flow to the lungs via the pulmonary artery. Once the right ventricle has emptied, the pulmonary valve closes, thereby keeping the blood from re-entering the right ventricle.