Question

based on their speed and force of contraction (which typically depends on their metabolism), muscle fibers can be generally classified as _. slow - twitch and fast - twitch fibers slow - tension and fast - tension fibers isotonic and isometric fibers 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:

Muscle fibers are commonly classified as slow - twitch and fast - twitch based on contraction speed and force related to metabolism. Slow - twitch fibers contract slowly but can sustain activity for long periods, while fast - twitch fibers contract quickly and powerfully but fatigue rapidly. There are no such things as slow - tension and fast - tension fibers as standard classifications. Isotonic and isometric refer to types of muscle contractions, not fiber classifications.

Answer:

slow - twitch and fast - twitch fibers