Question

what are reseptors.what are its functions

Answer 1

The eligible receiver, the quarterback, the wide receiver in the end zone - each of these football positions is a type of receptor. Cell receptors work in a similar way to football players: They receive signals and initiate a response. In biology, receptors are proteins or glycoproteins that receive signals by binding to signaling molecules, often called first messengers or ligands, that send a specific signal onward.

The ligand may be an unattached substance, like a chemical, amino acid, protein, lipid, or sugar; ligands can also include hormones, neurotransmitters, or drugs. Some receptors may be affected by environmental factors, like temperature, light, vibration, pressure, or even other receptors. In football, once a player catches the ball, the wide receiver changes his body position so that the ball won't be lost. In biology, receptors can also change their posture, or conformation, in response to ligand binding, which leads to a cascade of chemical reactions called signaling.

Answer 2

an organ or cell able to respond to light, heat, or other external stimulus and transmit a signal to a sensory nerve is called receptor.