When the human body perceives internal and external stimuli, it responds to maintain a stable internal environment. What is an example of an internal stimulus within the human body?

A) light

B) odor

C) sound

D) thirst

Thirst is an internal stimuli which notifies an individual on the decreased amount of water in the body. This stimuli arises when the amount of water in the body cells has decreased beyond a certain level. This usually occurs after sweating since there is increased loss of water from the body which needs to be replaced.