43. Endocrine System
Endocrine System
Multiple Choice
Multiple ChoiceWhich of the following examples is a role of the local regulator nitric oxide (NO)?
A
When secreted by certain white blood cells, NO stimulates the reproduction of some bacteria and cancer cells.
B
NO decreases the blood flow into the penis, producing an erection.
C
In the nervous system, NO serves as a cell surface receptor.
D
All of the listed responses are correct.
E
When oxygen levels fall, nitric oxide activates an enzyme that relaxes smooth muscle. This dilates blood vessels and improves blood flow.
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