Stimulus (physiology)

• In physiology, a stimulus is a detectable change in the physical or chemical structure of an organism's internal or external environment.

Sensitivity

• The ability of an organism or organ to detect external stimuli, so that an appropriate reaction can be made, is called sensitivity(excitability).

Receptors

• Sensory receptors can receive information from outside the body, as in touch receptors found in the skin or light receptors in the eye, as well as from inside the body, as in chemoreceptors and mechanoreceptors.

Reflux

• When a stimulus is detected by a sensory receptor, it can elicit a reflex via stimulus transduction.

Homeostatic control

• An is often the first component of a homeostatic control system.
• External stimuli are capable of producing systemic responses throughout the body, as in the fight-or-flight response.

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