What agent made by endothelial cells makes blood vessel smooth muscle cells relax?
A)nitrous oxide
B)acetylcholine
C)nitric oxide
D)cAMP
E)cGMP

Question

Quizplus · Accepted Answer

Nitric oxide (NO) is the agent made by endothelial cells that causes blood vessel smooth muscle cells to relax. NO acts as a vasodilator, signaling to the adjacent smooth muscle cells to relax and widen the blood vessel, allowing for increased blood flow. Acetylcholine and cAMP are involved in other signaling pathways and do not directly cause smooth muscle relaxation. cGMP can contribute to smooth muscle relaxation but it is not the primary agent made by endothelial cells.

What Agent Made by Endothelial Cells Makes Blood Vessel Smooth