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.
Stimuli can be divided into a range of different types or MODALITIES. Receptors normally respond to only one type of stimuli (or sensory modality), and that type of sensory modality is called the adequate stimulus for a particular type of stimulus.For example, the adequate stimulus for the eyes photoreceptors (rods and cones) is light and not touch (mechanical stimuli).) different sensory receptors adapt at different rates: touch and pressure receptors vs. pain receptors and certain proprioceptors. 3) different adaptation rates of receptors determines the nature of the information provided to the CNS. The receptors important for movement are mostly somatosensory receptors.