____ is the body's ability to maintain a state of internal balance.

Muscle fatigue is a state in which a muscle

a. uses sugar to metabolize ATP in order to continue contracting. b. uses oxygen in oxidative energy production to continue contracting. c. can no longer produce the energy it needs to continue contracting. d. becomes saturated with lactic acid and needs to continue contracting.

When a single personnel monitoring device is worn, it should be worn at the

a. waist level under the lead apron. b. collar level under a thyroid collar. c. collar level outside the lead apron. d. wrist level to get a measure of bone exposure.