AP BIOLOGY

Detailed explanation-1: -A stimulus is a change in the external or internal environment that produces a physiological response. When applied to sensory receptors, it provokes behavior or response. Internal stimuli (such as changes in blood pressure) and external stimuli (tactile, sound, smell, taste, vision, etc.).

Detailed explanation-2: -Stimuli are changes in the environment, and organisms must be able to adapt, or adjust, to these changes in order to survive these conditions. Stimuli come in many forms, but are usually the result of an energy source, such as light or sound, or a natural force, such as gravity.

Detailed explanation-3: -Environmental stimuli are things that happen in the environment that elicit a response or reaction from a person. For example, a drop in temperature may prompt some people to put on a coat or sweater. A loud thunder boom might elicit a startled jump.

Detailed explanation-4: -A stimulus is anything that can trigger a physical or behavioral change. The plural of stimulus is stimuli. Stimuli can be external or internal. An example of external stimuli is your body responding to a medicine. An example of internal stimuli is your vital signs changing due to a change in the body.

Detailed explanation-5: -Receptors. Receptors are groups of specialised cells. They detect a change in the environment stimulus. In the nervous system this leads to an electrical impulse being made in response to the stimulus.