WorksheetsCardiavascular System
Total questions: 36
Worksheet time: 18mins
What prevents blood from flowing back into the atria when the ventricles contract?
semilunar valves
sinoatrial node
atrioventricular node
tricuspid and bicuspid valves
This initiates the action potential that causes the heart to beat
Inferior vena cava
Atrioventricular node (AV node)
Superior vena cava
Sinoatrial node (SA node)
Which best explains why capillary walls are so thin?
because they do not need to pump blood
because they are found only in the smallest organs and tissues
because they maximize diffusion of nutrients
because blood only travels through them slowly
Why is coronary circulation necessary?
because blood needs to be pushed throughout the entire body
because the heart itself needs nourishment
because the scalp requires an exceptional amount of nourishment
