Question

what is an isotonic contraction? muscle contracts, but the bones it is attached to don’t move. a muscle changes in length, but its tension stays constant. a muscle tenses, but does not change length. need help? review these concept resources. rate your confidence to submit your answer. high medium low reading © 2025 mcgraw hill. all rights reserved. privacy center terms of use

Explanation:

An isotonic contraction is defined as a muscle - contraction where the muscle changes in length while the tension remains constant. The first option describes an isometric contraction (muscle contracts but no movement of attached bones), and the third option also describes an isometric contraction (muscle tenses without length change).

Answer:

A muscle changes in length, but its tension stays constant.