1 A badge or insignia consisting of stripes meeting at an angle, worn on the sleeve of a military or police uniform to indicate rank, merit, or length of service. 2  n. Heraldry A device shaped like an inverted V.  n.
In physiology, a stimulus (plural stimuli) is a detectable change in the internal or external environment. The ability of an organism or organ to respond to external stimuli is called sensitivity.When a stimulus is applied to a sensory receptor, it normally elicits or influences a reflex via stimulus transduction.ne internal stimulus that causes hormone release is blood pressure. Hypotension, or low blood pressure, is a large driving force for the release of vasopressin, a hormone which causes the retention of water in the kidneys.
The sensory neurons are highly adapted to detect changes of both external and internal changes in the environment and report these changes to the brain. Whether through touch, sound, taste, sight, or smell, the senses are constantly reporting variances, nuances, and dramatic changes within the environment to the brain.erception applies to internal stimuli as well. Perception tells the body of hunger, thirst, itching, or other bodily needs. This state of perception keeps the body alive. Without the perception of thirst, the body would dehydrate.