Question

Define stimuli and response.

Answer 1

Stimulus : Something that can elicit or evoke a response in a cell, a tissue, or an organism. It can be external or internal.

Response : A reaction to a specific stimulus.

Example : The body temperature is raised by the release of chemicals in white blood cells. This increased temperature kills bacteria and inhibit viruses.

Stimuli : Bacterial infection.
Response : Fever

Another response for internal stimuli,

Stimuli : Ingest Poison. Response : Vomiting

Other examples (external stimuli):

1. Stimuli : Baseball bat is thrown to the stand
Response : Raise hands or move away to avoid the hit

2. Stimuli : Touching a hot iron box
Response: Move hand