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Neurons

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  1. Neurons

  2. Do Now • Do Now • How does this relate to the Nervous System?

  3. Homework Due Today • Read Section 31.1 • Answer question 1-3 on page 900

  4. Homework • Describe the function of the nervous system? • The functions of the nervous sustem are to collect information about the body’s internal and external environments, process that information and respond to it

  5. Homework • Describe how your peripheral nervous system and central nervous system were involved in a simple activity you performed today.

  6. Homework • Name and describe the three types of neurons • Sensory neurons carry impulses from the sense organs. Motor neurons carry impulses from the brain and spinal cord to muscles and glands. Interneurons process the information from sensory neurons and send commands to other interneurons or motor neurons

  7. Homework • The immune system of people with multiple sclerosis attacks myelin sheaths in the CNS. The myelin breaks down and scar tissue may result. How do you think this would affect the transmission of signals from the CNS?

  8. Homework • What happens when a neuron in stimulated by another neuron? • If the stimulus is grat enough, an impulse begins that travels rapidly along the axon toward the axon terminals, where the impulse may be passed on to other cells

  9. Homework • How can the level of pain you feel vary if a stimulus causes and all-or-none response? • Although the response is all-or-none, the frequency of action potentials can vary depending on the strength of the stimulus

  10. Homework Due Next Class • Finish Worksheet • Define: • Peripheral Nervous System • Central Nervous System • Axon • Myelin Sheath • Threshold • Synapse • Neurotransmitter

  11. The Nervous System • The Nervous System

  12. The Nervous System • The Nervous System responds to information collected from internal and external environments • Comprised of Peripheral Nervous System and Central Nervous System

  13. Central Nervous System • Consists of the brain and spinal cord

  14. Peripheral Nervous System • All nerves and supporting cells that collect information about the body’s internal and external environment

  15. PNS/CNS • Constant communication is happening between the 2 nervous systems • You’re walking around in the dark and can’t see anything. Your hands are reaching for the light switch and your PNS relays the message of what it is touching to the CNS, which relays back to the PNS as to what it is supposed to be looking for.

  16. Neurons • All impulses (messages) are transmitted by cells called neurons • Sensory • Motor • Interneurons • Process sensory information and send commands to other neurons

  17. Structure of Neuron

  18. Cell Body • Largest part of a neuron • Houses the nucleus and most of cytoplasm

  19. Homework Due Next Class • Finish Worksheet • Define: • Peripheral Nervous System • Central Nervous System • Axon • Myelin Sheath • Threshold • Synapse • Neurotransmitter