A nursing instructor is explaining the role of vascular smooth muscle cells in relation to increases in systemic circulation
During discussion, which neurotransmitter is primarily responsible for contraction of the entire muscle cell layer thus resulting in decreased vessel lumen radius?
A)
Nitric oxide
B)
Adrenal glands
C)
Fibroblast growth factor
D)
Norepinephrine
Ans:
D
Feedback:
Nerve cells and circulating hormones are responsible for vasoconstriction of the vessel walls. Because they do not enter the tunica media of the blood vessel, the nerves do not synapse directly on the smooth muscle cells. Instead, they release the neurotransmitter, norepinephrine, which diffuses into the media and acts on the nearby smooth muscle cells, resulting in contraction of the entire muscle cell layer and thus reducing the radius of the vessel lumen. This increases the systemic circulation.
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