contestada


Which statement best explains this type of blood vessel and the function of these vessels’ valves?
These are arteries, which prevent the backflow of blood because the walls have little muscle to pump blood back to the heart.
These are veins, which prevent the backflow of blood because the walls have little muscle to pump blood back to the heart.
These are arteries, which prevent the backflow of blood because the walls have little muscle to pump blood into the capillaries.
These are veins, which prevent the backflow of blood because the walls have little muscle to pump blood into the capillaries.

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Some reminders are necessary:
Artery does not have valves, the blood pressure on it is very high, there is no risk of blood backflow, so it does not need valves
Arteries are vessels that transport blood from the heart to capillaries.
Veins are vessels that transport blood back to the heart from capillaries.


According to these reminders, you could conclude that:
A is false (no backflow in arteries)
C is false (no backflow in arteries)
D is false ( veins take blood to the heart)
so the right answer is B

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