Aneurotransmitter of the sympathetic division of the nervous system that increases the heart rate and constricts smooth muscle in blood vessels to raise blood pressure in the "fight or flight" response is called:
a. epinephrine.
b. aldosterone.
c. melatonin.
d. prolactin.

a. epinephrine.

Explanation:

Discovered in 1895, epinephrine, the hormone of "fight or flight" is a key neurotransmitter as man evolved.

Produced by the adrenal glands, it s main function is to trigger a quick response to potenital threats, seen an increased blood pressure to muscles, heart rate, pupils dilatation and increased metabolyizing of suger.

The incorrect levels of epinephrine will characterize a person suffering an anxiety disorder. If a situation requieres a stress response, epinephrine will help a living organism like mammals to answer quickly and surive.

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answer: 900

explanation: