BIOMOLECULES AND ENZYMES

Detailed explanation-1: -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-2: -An external stimulus is a stimulus that originates from outside the organism. For example, light is an external stimulus. It originates from outside the body, but it produces an effect within the body.

Detailed explanation-3: -In nervous system: Stimulus-response coordination. The simplest type of response is a direct one-to-one stimulus-response reaction. A change in the environment is the stimulus; the reaction of the organism to it is the response.

Detailed explanation-4: -Examples of stimuli and their responses: You are hungry so you eat some food. A rabbit gets scared so it runs away. You are cold so you put on a jacket.

Detailed explanation-5: -response to external stimulus Gene Ontology Term (GO:0009605) Definition: Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of an external stimulus.