Question

question 3
which of the following is true of the neurotransmitter serotonin?
○ it is not involved in the regulation of sleep.
○ its excess is responsible for depression.
○ its deficiency is responsible for parkinson disease.
○ it is involved in the regulation of mood and attention.

Explanation:

To solve this, we analyze each option:

• Option 1: Serotonin is involved in sleep regulation, so this is false.
• Option 2: Serotonin deficiency (not excess) is linked to depression, so this is false.
• Option 3: Parkinson's is related to dopamine deficiency, not serotonin, so this is false.
• Option 4: Serotonin plays a role in mood, attention, and other functions, so this is true.

Answer:

D. It is involved in the regulation of mood and attention. (Assuming the options are labeled A - D in order, with the last option being D)