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Kaplan Qbank USMLE



Author4 Posts
  #1

hypocalcemia causes tetany which is uncontrolled muscular contraction n is due to increase in exitability of motor neurons...my silly qs is calcium is required for muscle contraction...so if hypocalcemia then how uncontrolled muscular contractionrolling eyes

  #2

Normally, sodium voltage gated channels are guarded by calcium in order to repel sodium so that there isn't too much influx of sodium. However, in hypocalcemia, calcium levels decrease in interstitial fluid and blood, so the calcium guarding the sodium voltage gated channels compensate the decreased levels, thereby rendering these sodium volt. gated channels 'unguarded', so there's excessive influx of sodium. action potential is easily produced, because RMP reaches threshold faster and tissue becomes hyperexcitable.






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  #3

silver ,thanks a lot for the explanation

  #4

silver wrote:
Normally, sodium voltage gated channels are guarded by calcium in order to repel sodium so that there isn't too much influx of sodium. However, in hypocalcemia, calcium levels decrease in interstitial fluid and blood, so the calcium guarding the sodium voltage gated channels compensate the decreased levels, thereby rendering these sodium volt. gated channels 'unguarded', so there's excessive influx of sodium. action potential is easily produced, because RMP reaches threshold faster and tissue becomes hyperexcitable.


nodnod

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