Question 1
Heroin mimics the actions of endorphins, inhibiting pain signals. Heroin is an example of a(n):
◦ agonist.
◦ protagonist.
◦ antagonist.
◦ glial cell.
Question 2
If you touch a hot stove, your spinal cord can prompt you to withdraw your hand without having to send the message all the way to the brain. This is due to
◦ the reflex arc.
◦ neuroplasticity.
◦ the parasympathetic nervous system.
◦ the sympathetic nervous system.