A muscular contraction in which the length of the muscle remains the same; occurs when the contractile force equals the resistance to that force

A metered-dose inhaler (MDI) holds about _______ doses of the prescribed medication in a pressurized container with an attached mouthpiece

a. 50 b. 100 c. 600 d. 200

The lungs are composed of about ________ solid tissue

A) 5% B) 10% C) 25% D) 50%