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Hi, your post is informative and engaging. agonist is a drug that activates certain receptors in the brain. An antagonist drug blocks opioids by attaching to the opioid receptors without activating them. Antagonists cause no opioid effect and block full agonist opioids (Stahl, 2013). A GTP-binding protein that relays signals from a plasma membrane signal receptor, known as a G protein-coupled receptor, to other signal transduction proteins inside the cell( Stahl,2013). A protein pore in cellular membranes that opens or closes in response to a signaling chemical (its ligand), allowing or blocking the flow of specific ions. Ion channel receptors are usually multimeric proteins located in the plasma membrane (Stahl, 2015). Each of these proteins arranges itself so that it forms a passageway or pore extending from one side of the membrane to the other. These passageways, or ion channels, have the ability to open and