GENERAL HISTOLOGY

Detailed explanation-1: -Stimuli : Stimulations are detectable changes in the internal or external environment. Anything that affects or causes a temporary increase in the physiological activity or response of the whole organism or part of it. Stimulation is a change in the environmental conditions to which an organism reacts.

Detailed explanation-2: -The organism responds to the stimuli by means of a number of effectors, such as muscles and glands. Energy is generally used in the process. Organisms change their behavior in response to changes in the surrounding environment. For example, an organism may move in response to its environment.

Detailed explanation-3: -Internal stimuli are internal factors that cause an organism to respond in order to maintain homeostasis. In animals, there are nerve receptors inside the body that will pick up on changes that occur, such as oxygen and carbon dioxide levels, blood sugar levels, water levels, blood pH, and core body temperature.