Question

select the correct answer from each drop - down menu.
marks dentist gives him a shot before performing a root canal. the dentist says the shot is anesthesia and that mark wont feel any pain. mark feels his gums going numb, while the rest of his body is working fine. what has the anesthesia actually done?
the anesthesia has blocked

from carrying signals to the

.

Explanation:

To solve this, we recall how the nervous system works. Sensory neurons (or nerves) carry signals from the body (like gums) to the brain (or spinal cord, then brain) to process sensations. Anesthesia blocks sensory neurons from sending pain signals. So the first blank is "sensory neurons (or nerves)" and the second is "brain (or central nervous system)".

Answer:

First drop - down: sensory neurons (or nerves)
Second drop - down: brain (or central nervous system)