Nervous system: the nervous system collects information about changes inside and outside the body, decides how the body should respond and controls that response.
-brain: protected by the skull.
parts: -spinal cord: protected by the vertebral column
-peripheral nervous system: nerves outside the brain and the spinal cord
Neurons: the nervous system consist of a cast number of cells called neurons, supported by a special type of connective tissue, neuroglia.
Neurons cannot divide and for survival they need oxygen and glucose.
Neurons have: -irritability: they initiate nerve inpulses in reponse to stimuli from outside or inside the body
-conductivity: ability to transmit a impulse.