1 Blocking the voltage gated Na channels between R1 and R2 with TTX blocks You

1 blocking the voltage gated na channels between r1

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1 Blocking the voltage-gated Na channels between R1 and R2 with TTX blocks You correctly answered: the propagation of the action potential from R1 to R2. 2 + When voltage-gated Na channels between R1 and R2 are blocked with TTX, an action potential is still recorded at R1 because You correctly answered: the voltage-gated Na channels between the stimulus and R1 are unaffected by the TTX. 3 + +
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3/11/2020 PhysioEx Exercise 3 Activity 4 4/5 Review Sheet Results Puffer fish must be prepared carefully and properly before they can be eaten. Eating puffer fish can cause numbness of the lips, probably because You correctly answered: action potentials from sensory neurons in the lips are blocked. 4 What does TTX do to voltage-gated Na channels? Your answer: It inhibits the diffusion of Na+ across the voltage-gated Na+ channels. 1 + What does lidocaine do to voltage-gated Na channels? How does the effect of lidocaine differ from the effect of TTX? Your answer: They block the diffusion of Na+ across the channel. TTX is irreversible while lidocaine can be reversed. 2 + A nerve is a bundle of axons, and some nerves are less sensitive to lidocaine. If a nerve, rather than an axon, had been used in the lidocaine experiment, the responses recorded at R1 and R2 would be the sum of all the action potentials (called a compound action potential).
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  • Spring '20
  • Lidocaine, TTX, session ID

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