Nervous System...

First a little introduction about the nervous system…

The nervous system consists of the brain, spinal cord, sensory organs, and all of the nerves that connect these organs with the rest of the body. Together, these organs are responsible for the control of the body and communication among its parts. The brain and spinal cord form the control center known as the central nervous system (CNS), where information is evaluated and decisions made. The sensory nerves and sense organs of the peripheral nervous system (PNS) monitor conditions inside and outside of the body and send this information to the CNS. Efferent nerves in the PNS carry signals from the control center to the muscles, glands, and organs to regulate their functions. 

The size of the nervous system ranges from a few hundred cells in the simplest worms, to around 300 billion cells in African elephants… 

I think the role of the nervous system is very important because it controls the whole body, the nervous system controls the movements, everything we feel, the pain. the heat, etc.

The nervous system has three basic functions: sensitivity, integrative and motor.

- Sensory: Perceive changes (stimuli) internal and external receptors or receptive organs. Changes include a wide range of physical factors such as light, pressure or concentration of dissolved chemicals.

- Integrator: Analyze the sensory information and make the appropriate decisions. It activates or modifies the information that is stored and is retrieved from memory.

Motor: Causes muscle or gland responses. The nervous system can stimulate muscles and glands to act or inhibit them.

This is why I chose it, is the best and most important