A-LevelBiologyTransport in mammals9700/12 · Oct/Nov 2022 · Q351 Mark
Which statement about the structure of the heart is correct?
AThe semilunar valves close when the pressure in the ventricles falls lower than the pressure in the arteries.
Bmuscle called the septum separates the atria from the ventricles.
CThere is a small patch of tissue in the right atrium that acts to delay the electrical impulse.
DClosure of valves in the veins prevents backflow of blood into the ventricles.
✓ Correct answer
A: The semilunar valves close when the pressure in the ventricles falls lower than the pressure in the arteries.
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