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 anesthesia works in the nervous system. Nerve cells (neurons) carry sensory signals (like pain) to the brain (or spinal cord, but for dental pain, the signal goes to the brain). The anesthesia blocks neurons (or sensory nerves) from carrying pain signals to the brain. So the first blank should be "sensory neurons (or nerves)" and the second "brain".

Answer:

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