physio ex 9.0 ex 3

This is what I put. Double check it...

Review Sheet Results
1. What does TTX do to voltage-gated Na+ channels?
Your answer:
TTX blocks voltage-gated sodium channels so that they will not open.
2. What does lidocaine do to voltage-gated Na+ channels? How does the effect of lidocaine differ from the effect of TTX?
Your answer:
Lidocaine also blocks voltage-gated sodium channels so that they will not open.
3. 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). Would the response at R2 after lidocaine application necessarily be zero? Why or why not?
Your answer:
Lidocaine binds to Na+ ion and prevents the flow of the ions
4. Why are fewer action potentials recorded at recording electrodes R2 when TTX is applied between R1 and R2? How
well did the results compare with your prediction?
Your answer:
My prediction was correct. When the TTX was applied, the action potential could not be conducted between R1 and R2.
5. Why are fewer action potentials recorded at recording electrodes R2 when lidocaine is applied between R1 and R2?
How well did the results compare with your prediction?
Your answer:
My prediction was correct and it had the same result as to what happened with the TXX trial.
6. Pain-sensitive neurons (called nociceptors) conduct action potentials from the skin or teeth to sites in the brain involved
in pain perception. Where should a dentist inject the lidocaine to block pain perception?
Your answer:
The lidocaine should be injected very near the sensory nerve receptors and/or the sensory nerve supplying the skin or tooth.
The dentist I have now is the first one that does not have to give me multiple shots.

The larger the axon diameter, the greater the conduction velocity.

Thanks, trin! lol

I am trying to get my groove going! Miss this place!!! I need to start a surg. tech section....lol

What type of information would go in there? I wouldn't mind at all starting a new section. Maybe we can make it a sub-category of an already existing category?