33. Ms. Evil is trying to develop a toxin that would affect the nervous system o

Question

33. Ms. Evil is trying to develop a toxin that would affect the nervous system of her neighbor's dog, Boof, who barks for hours at a time. She hypothesizes that if she could develop a toxin that would just affect the muscle bands that are the vocal cords necessary for barking, she could get some sleep. She develops a compound that causes Na+ gates in axons to stay open. You correctly predict that when Ms. Evil injects Boof with this compound (through a hole in the fence), ______________.

a) action potentials in presynaptic neurons could still be measured

b) Boof’s vocal cords would continue to contract normally

c) transmission of an action potential across the synapses would continue

d) Na+ concentrations inside and outside the cell membrane of the axon would become approximately equal

e) (a), (c) and (d) would all occur

34. The next morning, Ms. Evil is surprised to see that Boof is quietly stretched out on the ground next to the fence. Alas, Boof is now silent and dead. You would correctly predict that Boof died of,             _.

a) barking to exhaustion

b) seizures

c) paralysis of breathing muscles

d) fear of Ms. Evil

e) a life-threatening heat gradient between the dog and the fence

Explanation / Answer

33).Sodium voltage gated channel is very important because they creat gradient .after open volatge gated na channel .neur neu depolarization and inactive na channel but if any drug that stay open the na channel.ultimatly it will maintain the sodium conc equal in both side.anser D

34) anwer (c) paralysis

Inhibitions of closing of na channel leads to equal the na conc both side and that leads to inhibite muscle contractiona and paralysis.

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