Nervous System


Your nervous system keeps you informed of changes in the environment. It also allows you to respond to these changes. For instance, suppose a car is approaching as you step off the curb. Sensory cells in your eyes respond, impulses are then carried along sensory nerves to the brain. The brain interprets the impulses and responds, sending impulses along motor nerves to the muscles in your legs and feet. This allows you to step back from the curb.
The nervous system is composed of a network of specialized cells called nerouns, that transmit signals between different parts of the body. The Nervous system consists of two parts; central and peripheral. The central nervous system (CNS) contains the brain, spinal cord, and retina. It is surrounded by bone-skull and vertebrae, also fluid and tissue insulate the brain and spinal cord. The peripheral nervous system (PNS) consists of sensory neurons, clusters of neurons called ganglia, and nerves connecting them to each other and to the central nervous system. Cranial nerves in the PNS take impulses to and from the brain. Spinal nerves take impulses to and away from the spinal cord.

The three basic functions of our nervous systems are:
  1. respond to stimuli
  2. recieve sensory input from internal and external enviorments
  3. integrate sensory input

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