1. specialized cells or structures that detect and respond to specific stimuli such as light, sound, chemicals, or touch
Usage: biology; medicine
2. protein molecules that bind to specific substances and trigger cellular responses
Usage: biochemistry; pharmacology

Examples

• The eye contains light receptors called rods and cones.
• Pain receptors in the skin alert us to potential injury.
• Drug molecules bind to specific receptors in the brain.
• Taste receptors on the tongue detect different flavors.
• Scientists study how insulin receptors respond to blood sugar changes.
• The inner ear has receptors that help maintain balance.
• Researchers are developing drugs that target cancer cell receptors.