Move seamlessly between your devices with Handoff, Universal Clipboard, iPhone Cellular Calls, SMS/MMS messaging, Instant Hotspot, and Auto Unlock. Each of these features, together known as Continuity, allow your devices to work together so that you can do more. Make and receive phone calls without picking up your iPhone. Start an email, edit a document, or surf the web on one device, then pick up where you left off on another. Unlock your Mac without typing a password. Even activate your iPhone hotspot without taking your iPhone from your pocket or bag.
Agonist. Definition. noun, plural: agonists. (pharmacology) A molecule that combines with a receptor on a cell to trigger physiological reaction. An example is an acetylcholine being the agonist that combines with the cholinergic receptor. (histology) A muscle that contracts while another muscle relaxes, e.g. when bending the elbow the biceps are the agonist.
Agonists have both affinity for the receptor and efficacy with respect to a response. Antagonist An antagonist is any molecule that is able to act as a ligand and bind to a receptor, by one of the methods mentioned above. The binding of an antagonist results in no response from the cell.