Question

In an ISOTONIC contraction, the muscle ___?_____.

A-never converts pyruvate to lactate
B-slowly lengthens
C-does not change in length but increases tension
D-changes in length and moves the "load"

Answer 1

In an isotonic contraction, the muscle length changes as a load is moved while the tension in the muscle stays constant. Isotonic contractions include concentric contractions, where muscles shorten, and eccentric contractions, where muscles lengthen while maintaining force. Option c.

Step-by-step explanation:

In an isotonic contraction, the muscle does not change in length but increases tension(C). During this type of contraction, the muscle length changes to move a load, but the muscle tension remains the same. There are two types of isotonic contractions: concentric and eccentric.

A concentric contraction occurs when the muscle shortens as it works to move a load, like lifting a weight upwards. Conversely, an eccentric contraction involves the muscle lengthening while still generating force, as when lowering a weight in a controlled manner. Isotonic contractions are fundamental in performing everyday activities that involve movement and balance.