Physiology lab #3

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  1. Describe the steps of an Action Potential from stimulus back to RMP including opening/closing of voltage gates, movements of ions, etc.
    Stimulus received---> Stimulus is strong enough to reach threshold---> VG Na+ channels are going to open---> Na+ rushes into the cell---> rapid depolarization---> Peak of A.P.---> VG Na+ channels close & VG K+ channels open---> K+ rushes out of the cell---> causes repolarization--->RMP---> Some VG K+ channels remain open---> causes hyperpolarization---> VG K+ channels close---> Na+ K+ ATP pump (3 Na+ out of cell & 2K+ in the cell)---> True RMP (Homeostasis)
  2. Resting membrane potential for a neuron
  3. Equilibrium potentials for K+ and Na+
    • K+= -90mV
    • Na+= 60-65 mV
  4. How do neurons of the nervous system communicate with one another?
    Through synapses and neurotransmitters
  5. Discuss the similarities between EPSP & IPSP
    • No Threshold
    • Can sumate
    • No refractory period
  6. Discuss the differences between the EPSP & IPSP
    • IPSP- causes hyperpolarization which inhibits and A.P,
    • EPSP- causes depolarization which allow A.P.
  7. Alpha Waves
    Are produced by the visual association areas of the parietal and occipital lobes and predominate when the subject is relaxed and awake but has eyes closed.
  8. Beta Waves
    Are strongest from the frontal lobes and reflect the evoked activity produced by visual stimuli and mental activity
  9. Delta Waves
    Emitted from the cerebral cortex and are seen in awake infants. Common in adults during deep sleep, the presence if delta waves in an awake adult indicates brain damage
  10. Theta Waves
    • Emitted from the temporal and occipital lobes; are common in newborn infants and sleeping adults
    • In awake adults generally indicate severe emotional stress.
  11. Label a diagram of an action potentialImage Upload
  12. Neuron
    Nerve cell consists of 3 regions---dendrites, cell body, axon
  13. Potential Difference
    Voltage will be measured across the axon membrane
  14. Resting Membrane Potential
    Maintained by unequal distribution of ions on the two sides of the membrane.
  15. Action Potential
    Momentary reversal and reestablishment of the resting potential
  16. Stimulus
    increase in amplitude as the voltage increase
  17. Threshold
    when stimulating voltage reaches a sufficient level to become depolarized
  18. Depolarization
    Potential difference reduced (become more positive)
  19. Repolarization
    Return to resting membrane potential (become more negative)
  20. Hyperpolarization
    More negative than RMP, requires active transport (Na/K ATP pump)
  21. All or none law
    a neuron does not fill or fires maximally
  22. Synapse
    • Functional connection between a neuron and another neuron or effector cell
    • Transmission in one direction only
Card Set:
Physiology lab #3
2011-10-05 20:32:47
Nervous System physiology lab

Nervous System #1
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