Question

Blood doesn't flow back when the right ventricle pushes the blood upwards into the pulmonary artery give reason

Answer 1

Answer:

Blood doesn't flow back when the right ventricle pushes the blood upwards into the pulmonary artery because pulmonary artery contains valves which restrict the flow of blood backwards...

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Answer 2

Answer:

Hey nice question

So have you seen the water valve. I guess you have right? The same is the function of semilunar valve present in the pulmonary artery as soon as ventricles pump blood in the artery these valves close and prevent backflow of blood.

Thanks for asking