Differences between isometric and isotonic contractions

What happens during an isometric contraction?

A) A muscle develops tension without changing length | B) A muscle shortens while tension drops to zero | C) A muscle lengthens rapidly without tension | D) A muscle changes length while maintaining constant tension

A muscle develops tension without changing length

Which everyday action relies heavily on isometric contractions?

A) Lifting a dumbbell upward | B) Lowering a dumbbell slowly | C) Maintaining posture and joint stability at rest | D) Flexing the elbow to curl a weight

Maintaining posture and joint stability at rest

When does an isotonic contraction begin during a lift?

A) Before any tension develops in the muscle | B) Only after the muscle completely relaxes | C) While the weight is still resting motionless on the floor | D) Once internal tension builds enough to overcome the external resistance

Once internal tension builds enough to overcome the external resistance

What happens to muscle length and tension during an isotonic contraction?

A) Length stays constant while tension rises | B) Muscle changes length while maintaining essentially constant tension | C) Both length and tension remain completely unchanged | D) Tension drops to zero as the muscle shortens

Muscle changes length while maintaining essentially constant tension

What are the two forms of isotonic contraction?

A) Concentric and eccentric | B) Isometric and tetanic | C) Aerobic and anaerobic | D) Voluntary and involuntary

Concentric and eccentric

Which type of contraction occurs when a muscle shortens as it maintains tension (e.g., lifting a dumbbell)?

A) Isometric contraction | B) Eccentric contraction | C) Concentric contraction | D) Passive relaxation

Concentric contraction

Which type of contraction occurs when a muscle lengthens while maintaining tension to act as a brake (e.g., slowly lowering a dumbbell)?

A) Concentric contraction | B) Isometric contraction | C) Treppe contraction | D) Eccentric contraction

Eccentric contraction

During which phase of lifting do weight lifters most commonly suffer muscle injuries?

A) Concentric phase | B) Eccentric phase | C) Resting phase | D) Isometric phase

Eccentric phase (because sarcomeres pull one way while the weight pulls the muscle the opposite way)