Question

During isotonic contractions, myofilaments are sliding. What distinguishes concentric from eccentric isotonic contractions?

A) Concentric contraction involves shortening of the muscle, while eccentric contraction involves lengthening.

B) Concentric contraction involves lengthening of the muscle, while eccentric contraction involves shortening.

C) Both concentric and eccentric contractions involve shortening of the muscle.

D) Both concentric and eccentric contractions involve lengthening of the muscle.

Answer 1

Concentric contractions involve muscle shortening, while eccentric contractions involve muscle lengthening.

Step-by-step explanation:

During isotonic contractions, muscle length changes to move a load. There are two types of isotonic contractions: concentric and eccentric. A concentric contraction involves the muscle shortening to move a load. An eccentric contraction involves the muscle lengthening as the tension diminishes.