MEDICAL PHYSIOLOGY

Detailed explanation-1: -Drugs that bind to neurotransmitter receptors, mimicking the activity of a neurotransmitter chemical binding to the receptor, are called agonists.

Detailed explanation-2: -Agonists are substances that bind to synaptic receptors and increase the effect of the neurotransmitter. Antagonists also bind to synaptic receptors but they decrease the effect of the neurotransmitter.

Detailed explanation-3: -Acetylcholinergic neurons in particular are active during the dreaming phase of sleep. It seems that the brain recharges neurotransmitter levels with sleep, so sleep ensures that neurotransmitters like dopamine are increased naturally.

Detailed explanation-4: -An agonist is a chemical that amplifies the effect of a neurotransmitter by binding to the receptor sites of that neurotransmitter and activating them. This is opposite of an antagonist which binds to receptors and blocks them from firing.