MICROANATOMY

Detailed explanation-1: -The fire alarm sound (conditioned stimulus) was associated with fire and also lead to the same response (conditioned response).

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: -An external stimulus is the one which the organism receives from its external environment. An internal stimulus is the one which arises within the body. The external stimulus includes touch and pain, vision, smell, taste, sound, and balance.

Detailed explanation-4: -excited by three types of stimuli-mechanical, thermal, and chemical; some endings respond primarily to one type of stimulation, whereas other endings can detect all types.