Nervous System In Humans

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Nervous System In Humans

  1. 1. NERVOUS SYSTEM IN HUMANS Grade 12 Exercise science Kevin Lee
  2. 2. Table of Contents <ul><li>The 2 types of Nervous system in humans </li></ul><ul><ul><li>Central Nervous System </li></ul></ul><ul><ul><li>Peripheral nervous system </li></ul></ul><ul><ul><ul><li>The relative of peripheral nervous system </li></ul></ul></ul><ul><li>Nervous tissues </li></ul><ul><ul><li>Neurons </li></ul></ul><ul><ul><li>Glial cells </li></ul></ul><ul><li>How it functions? </li></ul>
  3. 3. Central Nervous System <ul><li>The central nervous system (CNS) is the largest part of the nervous system, and includes the brain and spinal cord. </li></ul><ul><li>The spinal cavity holds and protects the spinal cord, while the head contains and protects the brain. </li></ul>
  4. 4. Peripheral nervous system <ul><li>The bodies of the nerve cells lie in the CNS, either in the brain or the spinal cord </li></ul><ul><li>The longer of the cellular processes of these cells, known as axons, extend through the limbs and the flesh of the torso </li></ul>
  5. 5. Peripheral nervous system <ul><li>Somatic nervous system </li></ul><ul><li>Automatic nervous system </li></ul><ul><ul><li>Sympathetic division </li></ul></ul><ul><ul><li>Enteric division </li></ul></ul><ul><ul><li>Parasympathetic division </li></ul></ul>
  6. 6. Nervous tissue Nervous tissue is composed of two main cell types: neurons and glial cells. -Neurons transmit nerve messages. -Glial cells are in direct contact with neurons and often surround them.
  7. 7. Neurons <ul><li>The neuron is the functional unit of the nervous system. While variable in size and shape, all neurons have three parts. </li></ul><ul><li>Dendrites receive information from another cell and transmit the message to the cell body. </li></ul><ul><li>The cell body contains the nucleus, mitochondria and other organelles typical of eukaryotic cells. The axon conducts messages away from the cell body. </li></ul>
  8. 8. Glial cells <ul><li>Glial cells provide support and protection for neurons </li></ul><ul><li>The four main functions of glial cells are to surround neurons and hold them in place, to supply nutrients and oxygen to neurons, to insulate one neuron from another </li></ul><ul><li>To destroy pathogens and remove dead neurons. They also modulate neurotransmission </li></ul>
  9. 9. <ul><li>Sensor in put </li></ul><ul><li>Integration (brain analyze) </li></ul><ul><li>Motor output (react) </li></ul>
  10. 10. Messages to Neurons <ul><li>Messages is received by the dendrites </li></ul><ul><li>Axon creates signal usually a chemical messenger called a neurotransmitter </li></ul><ul><li>Signal travels to axons </li></ul><ul><li>Message is transferred to connected to neuron via synaptic terminal </li></ul>

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