Maintaining a posture for a prolonged period of time requires muscles that are slow to fatigue and able to make small adjustments in muscle tension.Therefore,muscles with a high percentage of ________________muscle fibers would be very active during a maintained posture.
A) Type I
B) Type IIB
C) Type IIA

Question

Quizplus · Accepted Answer

Type I muscle fibers, also known as slow-twitch fibers, are highly resistant to fatigue and are specialized for endurance activities such as posture maintenance. They have a high oxygen capacity and are capable of producing low levels of force over a prolonged period of time, making them ideal for sustained muscle contractions. Type IIA and IIB muscle fibers, on the other hand, are fast-twitch fibers that are better suited to short, powerful bursts of activity such as sprinting or weightlifting. Therefore, the best choice for muscles that are active during maintained posture would be muscles with a high percentage of Type I muscle fibers.

Maintaining a Posture for a Prolonged Period of Time Requires