What does a sleep latency of less than 5 minutes indicate?

The pressure against which the heart must pump is called:

a. afterload. c. preload. b. peripheral vascular resistance. d. cardiac contractile force.

Carbon dioxide is not effective in extinguishing fires in chemicals containing their own ______

a. oxygen, such as cellulose nitrate b. carbon, such as hydrocarbon fuels c. Class A fuel d. Class B fuel