The thin membrane lining the inside of the cardiac muscle is known as the:

What differentiates running from walking is that during running there is a float moment in which

a. both feet are off the ground at the same time. b. the feet are on the ground at the same time. c. both legs swing forward at the same time. d. both feet lightly touch the ground at the same time.

Runoff water contaminated with fuel floating on top presents a danger to firefighters because protective clothing can:

a. more easily cause overheating. b. become heavier when wet. c. cause slips and falls to become more likely. d. absorb fuel in a wicking action.