ANATOMY

Detailed explanation-1: -Light, water and touch are all examples of stimuli. A stimulus is an external disturbance which triggers a response.

Detailed explanation-2: -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.

Detailed explanation-3: -Stimulus is an event or any change in the external environment that evokes a specific functional reaction in an organ or tissue. stimulus can be internal or external. Sense organs, such as the ear, and sensory receptors, such as those in the skin, are sensitive to external stimuli such as sound and touch.

Detailed explanation-4: -Irritants. Sights. Smells. Sounds. Temperature changes.

Detailed explanation-5: -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. A dog is hot so lies in the shade. It starts raining so you take out an umbrella.