Which statement about the structure of the heart is correct?
The semilunar valves close when the pressure in the ventricles falls lower than the pressure in the arteries.
2 )
A muscle called the septum separates the atria from the ventricles.
3 )
There is a small patch of tissue in the right atrium that acts to delay the electrical impulse.
4 )
Closure of valves in the veins prevents backflow of blood into the ventricles.
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