a) What is the function of the atrioventricular valves? b) When the ventricles are contracting, are the arterioventricular valves open or closed? c) Explain why the muscle walls of the atria are thinner than the walls of the ventricles.
a) To prevent backflow of blood from the ventricles into the atria.b) Closedc) The atria only have to pump blood into the ventricles, where as the ventricles have to pump blood at a high pressure all the way around the body/lungs.
CO
Related Biology GCSE answers
All answers ▸Are diffusion and osmosis the same thing?
It is common to selectively breed domestic animals/pets, such as cats and dogs. Give three reasons people may want to selectively breed dogs.
Describe the function of the Bowmans's capsule
How does temperature affect enzymes?