The nervous system

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The nervous system

  1. 1. The Nervous System ระบบประสาท The nervous system is a way to send signals through your body.
  2. 2. Nerves under a microscope
  3. 3. All multicellular organisms have a nervous system EXCEPT placozoa sponge
  4. 4. Central Nervous System The central nervous system is the brain and spinal cord. The nervous system can communicate up to 100 meters per second.
  5. 5. The hypothalamus The hypothalamus controls many things in your body, like temperture, blood pressure, water balance, thirst and hunger.
  6. 6. Peripheral nervous system The peripheral nervous system is outside the brain and spinal cord. There are about 65 kilometers of nerves in the human body!
  7. 7. Somatic nervous system • This part of your peripheral nervous system controls voluntary muscles.
  8. 8. Autonomic nervous system • This controls involuntary muscles like your heart.
  9. 9. The brain
  10. 10. The brain The brain controls the nervous system. It weighs about 1300 grams. Our brain loses about 1 gram per year as we age. The brain uses 20% of the oxygen and blood in the body. The brain makes enough electricity to light a lightbulb.
  11. 11. Stress • Long term stress can damage your nervous system.
  12. 12. Scientists are trying to create an artificial brain.
  13. 13. Neuron cells They are the largest cells in the body. Up to 1 meter long! They communicate information around the body.
  14. 14. Sensory and motor nerves • Sensory nerves receive information and send it to the brain. • Motor nerves send information from the brain to the muscles.
  15. 15. Ulnar nerve “funny bone” If you hit your ulnar nerve, it can be very painful.
  16. 16. Optic nerve The optic nerve sends visual information to the brain.
  17. 17. Auditory nerve The auditory nerves send sounds to your brain.
  18. 18. paralyzed Some people cannot move their legs and/or arms. This is usually because of a spinal injury or a birth defect.
  19. 19. When a body part “falls asleep” This happens when you squeeze nerves for a long time. Sometimes you feel tingling or pain. After you move, the nerves will “reset”. Sitting a long time on a hard floor can cause this.
  20. 20. reflex A reflex happens without thinking, and is usually done to protect you.
  21. 21. pain We feel pain because we have nerves. If we didn’t feel pain, we would probably die quickly because we wouldn’t know when we are hurt.
  22. 22. “You’ve got a lot of nerve!” • This means that someone is being an arrogant หยิ่ง jerk.
  23. 23. Real nerves
  24. 24. Nerves help us move • The brain sends messages to muscles using the nervous system.
  25. 25. Senses • Hearing, touch, sight, smell and taste are your five senses. Nerves let you do these things.
  26. 26. Is our nervous system our “soul”?
  27. 27. Questions • What are our five senses? • What are some things nerves do? • What can happen if the nerves in your spinal cord are damaged? • What nerves let us see and hear? • What power do our nerves use to communicate? • What are the two main parts of the central nervous system?

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