Whqt are antagonists and agonists???

1.Agonist and antagonist act in opposite directions. When agonist produces an action, antagonist opposes the action. 2. Agonist works when the muscles relax and antagonist works when muscles contract. 3. While agonists stimulate an action, antagonists sit idle, doing nothing. 4. An agonist ties to a receptor site and causes a response whereas an antagonist works against the drug and blocks the response. 5. Agonists are also chemicals or reactions, which help in binding and also altering the function of the activity of receptors. On the other hand, antagonists though help in binding receptors, they do not alter its activity. 6. When agonist is a compound that impersonate the action of neurotransmitter, antagonist blocks the action of neurotransmitter. 7. Agonist has been derived from late Latin word agnista, which means contender. Antagonist has been derived from Latin antagonista and from Greek antagonistes, which means “competitor, rival or opponent.”

antagonists - drugs that bind to the receptor site & inhibit its natural function ; agonists - drugs that copy the natural messenger by switching on the receptor

Drugs