AP BIOLOGY

Detailed explanation-1: -For example, the smell of food is an unconditioned stimulus, a feeling of hunger in response to the smell is an unconditioned response, and the sound of a whistle when you smell the food is a conditioned stimulus.

Detailed explanation-2: -External stimulus. The external stimulus includes touch and pain, vision, smell, taste, sound, and balance (equilibrium). These sensory stimuli are activated by external changes. Pain and touch: Pain is the stimulus that can cause a major response from the body.

Detailed explanation-3: -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-4: -The digestive system can respond to external stimuli, such as the sight or smell of food, and cause physiological changes before the food ever enters the body.

Detailed explanation-5: -external stimulus (plural external stimuli) A signal (stimulus) that originates from outside an organism.