Question

part a
which blood vessels allow blood to move directly from the arterial to the venous circulation?
precapillary sphincters
venules
collateral arteries
metarterioles

Explanation:

Precapillary sphincters control blood - flow into capillaries. Venules receive blood from capillaries. Collateral arteries are alternative pathways for blood - flow. Metarterioles are short vessels that connect arterioles and venules, allowing blood to move directly from arterial to venous circulation.

Answer:

D. Metarterioles