THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Any detectable change in the environment is called a stimulus. In order for an organism such as a plant or an animal to adjust to a change in the environment, it must first be able to detect or physically recognize the change. This detection of a stimulus is called sensitivity.

Detailed explanation-2: -A stimulus is a change in the external or internal environment that produces a physiological response. When applied to sensory receptors, it provokes behavior or response. Internal stimuli (such as changes in blood pressure) and external stimuli (tactile, sound, smell, taste, vision, etc.).