Which of the following statements regarding skeletal muscle contraction is true?
A)During a lengthening contraction,the tension exerted by the muscle exceeds the load on the muscle.
B)In every isotonic muscle contraction,the length of the muscle remains constant.
C)During every muscle contraction,muscle fibers change length.
D)During every muscle contraction,tension is developed in the muscle.
E)Cross-bridges cycle faster during isometric contractions than during isotonic contractions.

Question

Quizplus · Accepted Answer

During every muscle contraction, tension is developed in the muscle. The tension produced by the muscle may or may not be enough to lift the load or move the body part, depending on the type of contraction. In isometric contractions, the muscle length remains constant, while in isotonic contractions, the muscle changes length. In a lengthening contraction, the tension exerted by the muscle is less than the load on the muscle, while in a shortening contraction, the tension exerted by the muscle exceeds the load on the muscle. Cross-bridges cycle faster during isotonic contractions than during isometric contractions.

Which of the Following Statements Regarding Skeletal Muscle Contraction Is