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22-06-2019
Biology

contestada

Which of the following is true of valves in veins?
A) They are associated with venous sinuses
B) They are most abundant in limbs
C) They contract to propel blood forward
D) They prevent blood pressure in veins from dipping below that of arteries

Respuesta :

ocean93 ocean93

05-07-2019

Answer:

A

Explanation:

they are associated with venous sinuses.this valve open one way flow of direction of the heart.

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