AN SC 310 - 6b

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Author:
ebacker
ID:
175268
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AN SC 310 - 6b
Updated:
2012-10-03 14:48:20
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AN SC 310
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Lecture 6 - Action Potentials Na+ and K+ Gating Summary Table 7.3 R = resting D = Depolarization Rp = Repolarization Hp = After-Hyperpolarization
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  1. What is the membrane potential during R, D, Rp, Hp?
    • R: -70 mV
    • D: -70 mV to +30 mV
    • Rp: +30 mV to -70 mV
    • Hp: -70 mV to -85 mV
  2. What is the overall state of the voltage-gated Na+ channels during R, D, Rp, Hp? What is the state of the activation and inactivation gates during each?
    • R: CLOSED, closed, open
    • D: OPEN, open, open
    • Rp: CLOSED, open,closed
    • Hp: CLOSED, closed, open
  3. What is the strength, direction, and mechanism of Na+ flow during R, D, Rp, Hp?
    • R: low, inward, leak channels
    • D: high, inward, voltage-gated channels
    • Rp: low, inward, leak channels
    • Hp: low, inward, leak channels
  4. What is the state of the voltage-gated K+ channels during R, D, Rp, Hp?
    • R: closed
    • D: closed
    • Rp: open
    • Hp: closing
  5. What is the strength, direction, and mechanism of K+ flow during R, D, Rp, Hp?
    • R: low, outward, leak channels
    • D: low, outward, leak channels
    • Rp: high, outward, voltage-gated channels
    • Hp: high, outward, voltage-gated channels but decreasing

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