Which of the following is the second leading cause of fatal injury for on-duty firefighters?

Certain blood vessels that contain specialized sensors that detect the level of internal pressure and transmit messages to the nervous system, which then triggers the smooth muscle in the vessel walls to make any needed size adjustments, are called:

A) pressure receptors. B) chemoreceptors. C) volume receptors. D) stretch receptors.

Naloxone hydrochloride (Narcan®) is a narcotic _____ used to reverse the sedative, hypotensive, and respiratory depressive effects of narcotics

a. additive b. agonist c. antagonist d. synergist