What muscle group flexes the knee?

With suspected head-injured patients, it is important to avoid hyperventilation because:

A) it increases oxygen supply and activates free radical damage. B) it correlates to increased mortality after return of circulation. C) it will cause an extreme shift in the acid-base levels in the brain. D) it decreases oxygen supply to the already injured brain tissue.

Research shows that if maintaining health and fitness is the goal, a nation should sponsor sports that are

A. based on a power and performance model. B. noncompetitive and have aerobic benefits. C. competitive and have important rewards for winners. D. attractive to spectators as well as active participants.