The nervous system

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  • The nervous system
    • It allows humans to react to their surroundings and coordinates behaviour.
    • The nervous system responds by; skin,tongue, nose ,eyes and ears.
    • Receptors are cells that can detect stimuli (changes in the enivironment)
      • receptors are often located in the sense organs
      • When a receptor is stimulated it sends signals along the nerve cells (neurons) to the brain. The brain then coordinates the response.
    • The central nervous system consists of the brain and the spinal cord.
    • Neurons are nerve cells that carry information as tiny electrical signals
      • Sensory neurons
        • Carry signals from the receptor to the spinal cord and brain.
      • Motor neurons
        • Carry signals from the CNS to the effector
      • Relay neurons
        • Carry signals from one part of the CNS to another.
    • A synapse is the tiny gap when two neurons meet. Signals cross the gap using chemicals called neurone transmitters.
    • Reflex actions
      • These are very quick responses that do not involve the brain.
      • STIMULAS
        • RECEPTOR
          • SENSORY NEURON
            • RELAY NEURON
              • MOTOR NEURON
                • EFFECTOR
    • An effector is any part of the body that produces the response.


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