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Receptor sites are proteins typically found on the surface of cells, which are capable of recognizing and bonding to specific molecules. A cell is a self-enclosed system, and it serves as the basic unit of life.
Cell-surface receptors are transmembrane proteins embedded in the plasma membrane of target cells. These receptors consist of an extracellular domain containing the ligand-binding site, a transmembrane domain, and an intracellular domain that transmits the signal inside the cell.
There are three general categories of cell-surface receptors: ion channel-linked receptors, G-protein-linked receptors, and enzyme-linked receptors. Ion channel-linked receptors To form a channel, this type of cell-surface receptor has an extensive membrane-spanning region.
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The sections that follow discuss the major types of signaling molecules and the receptors with which they interact. Subsequent discussion in this chapter focuses on the mechanisms by which cell surface receptors then function to regulate cell behavior.
Receptors are typically glycoproteins located in cell membranes that specifically recognize and bind to ligands. These are smaller molecules (including drugs) that are capable of 'ligating' themselves to the receptor protein.
Receptors are biological transducers that convert energy from both external and internal environments into electrical impulses. They may be massed together to form a sense organ, such as the eye or ear, or they may be scattered, as are those of the skin and viscera. Receptors are connected to the central nervous system by
See the definition of receptor sites in psychology and find how they differ from receptor cells. Discover different types of receptor sites.
Receptors are the structures (and sometimes whole cells) that detect sensations. A receptor or receptor cell is changed directly by a stimulus.
Well-known examples include the β-adrenergic receptor, the muscarininc type of acetylcholine receptor, metabotropic glutamate receptors, receptors for odorants in the olfactory system, and many types of receptors for peptide hormones.