ANATOMY

Detailed explanation-1: -Stimulation is a change in the environmental conditions to which an organism reacts. All organisms react when exposed to external stimuli.

Detailed explanation-2: -The nervous system takes in information through our senses, processes the information and triggers reactions, such as making your muscles move or causing you to feel pain. For example, if you touch a hot plate, you reflexively pull back your hand and your nerves simultaneously send pain signals to your brain.

Detailed explanation-3: -Although the sensory systems associated with these senses are very different, all share a common function: to convert a stimulus (such as light, or sound, or the position of the body) into an electrical signal in the nervous system. This process is called sensory transduction.

Detailed explanation-4: -Receptors. Receptors are groups of specialised cells. They detect a change in the environment stimulus. In the nervous system this leads to an electrical impulse being made in response to the stimulus.

Detailed explanation-5: -Sudden action in response to something in the environment is called reflex action. The path through which signals are transmitted from a receptor to a muscle or a gland is called a reflex arc. Sensory neurons carry signals from receptors to the spinal cord and brain.