Module 7.2 Nervous system

Module 7.2 Nervous system

1. The nervous system is a communication network that has controls over all the other systems in your body.

2. Nervous system is a communication network that has controls on the other body systems.

3. Two parts of nervous system

   • Central Nervous system (CNS)
     • Make up your brain and spinal cord.
     • CNS collect info from around the body, handles the info, then sends out messages after instructs the body on how to respond.
   • Peripheral Nervous system (PNS)
     • Make up the nerves that carry messages to and from the CNS

4. Neurons

   • Specialised cells that transmit electrical messages from one part of the body to another at very high speed.
     • Nerve impulses
       • Electrical messages
       • Travel in only one direction
       • Neurotransmitter is a chemical message released at the end of an axon
       • Synapse is the space between two neurons
   • Cell body
     • Nucleus is the control centre of the cell
     • Dendrites are branches from the cell body that receive menages from other neutrons.
     • Axon is the nerve fiber that sends nerve impulses away from the cell.
   • Types of neurons
     • Motor neurons
       • Carry messages from the CNS to effectors
     • Connector neurons
       • Transmit messages between neutrons in the CNS.
     • Sensory neurons
       • Specialised receptors which carry messages to the brain and spinal cord from cells in the same organs
   • Myelin sheath is the insulating layer that covers a neuron.

5. Brain

   • Contains 100 billion neurons
   • Controls and regulates body functions.
   • MRI (Magnetic Resonance Imaging)
     • Strong magnetic fields that are used to determine different types of body tissue.

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