AP BIOLOGY

Detailed explanation-1: -Stimulus is of two types, external and internal. Smell, sound, etc., are examples of external stimuli and hunger, thirst, etc., are examples of internal stimuli.

Detailed explanation-2: -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-3: -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. Pain can also change the behavior of the organism.

Detailed explanation-4: -These specialized cells and parts of the immune system offer the body protection against disease. This protection is called immunity. Humans have three types of immunity-innate, adaptive, and passive: Innate immunity: Everyone is born with innate (or natural) immunity, a type of general protection.