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2011-10-08 06:35:26
Nervous System

Nervous System
Show Answers:

  1. What is the functional unit of a nervous system?
  2. What is the structure of a neuron?
    Dendrite carries info to the cell body, then the cell body carries to the axon.
  3. List the anatomical parts of the nervous system, and provide their function?
    • A. Cell body- where metabolism takes place
    • B. Dendrite- impulse sends to cell body
    • C. Axon- away from cell body
    • D. Terminal- distal end, contains NT
  4. What are the 3 functional types of neurons, their alternate names, and functions?
    • A. sensory- (afferent) receptor > sensory neuron > CNS
    • B. motor- (efferent) CNS > motor neuron > effector
    • C. association- located between the sensory and the motor paths- higher function
  5. Define receptor?
    structure that responds to a stimulus
  6. define effector?
    structure that carries out a response
  7. What reproductive ability do neurons have?
  8. What are the 3 requirements for axon degeneration?
    • 1. peripheral location
    • 2. cell body intact and functioning
    • 3. unobstructed path
  9. What type of tissue is a neuroglial cell?
    connective tissue (CT)
  10. What is the reproductive ability of a neuroglial cell?
    It can under go cell division.
  11. What are thefunctions of a neuroglial cell?
    • 1. supports and protects neuron
    • 2. mylelin sheath insulates neuron
  12. Define action potential and what's it's role?
    • Change in potential that occurs if the membrane is depolarized from resting to threshold.
    • Role- primary signal for info transmission
  13. List the parts of action potential?
    • 1. depolarization
    • 2. repolarization
    • 3. hyperpolarization
    • 4. return to resting
  14. How is each part of action potential changed relative to resting potential?
    • 1. depolarization- potential becomes more + d/t Na+ inflow
    • 2. repolarization- potential becomes more - d/t to K+ outflow
    • 3. hyperpolarization- potential < resting
    • 4. return to resting- d/t Na+ and K+ pump
  15. What are the 2 types of electrical transmission?
    continuous and saltatory
  16. Whisch type of neuron does continuous occur? Describe the process in transmission.
    • 1. unmyelinated fibers
    • 2. AP at all locations
    • 3. proximal to distal
    • 4. slower
  17. Which type of neuron does saltatory occur? Describe the process in transmission.
    • 1. myelinated fibers
    • 2. AP at Nodes of Ranvier
    • 3. faster
  18. What are 2 types of chemical transmission?
    synapse and neurotransmitter (NT)
  19. Define synapse?
    site of a chemical transmission between a neuron and another structure
  20. Define neurotransmitter?
    carries out chemical transmission
  21. What must happen to the neurotransmitter after it has it's effect?
    It must be removed.