To answer this question, there is a need to understand what vascular spasms are. The vascular spasm is known to be the tightening of the blood vessel. This may happen in a very brief period. This can cause the blood flow to be restricted for a certain period of time.
There are also times when the blood vessel may become completely blocked. A is the answer to this question because there are instances when serotonin may cause the blood vessels to become constricted. Serotonin is a type of hormone that is usually related to people’s moods. Low levels of serotonin are considered to be a sign of having depression.
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