Question

Muscle Fiber Type IIa is classified as fast oxidative. What is its percent contribution of fuel source at rest?

A) 100% glycogen
B) 50% glycogen, 50% fatty acids
C) 70% glycogen, 30% fatty acids
D) 30% glycogen, 70% fatty acids

Answer 1

At rest, Type IIa muscle fibers use a mix of fuel sources, with approximately 70% glycogen and 30% fatty acids contributing to ATP production.

Step-by-step explanation:

Type IIa muscle fibers, classified as fast oxidative, primarily use aerobic respiration to produce ATP. This means that they rely on oxygen and glucose as fuel sources. At rest, Type IIa muscle fibers have a mix of fuel sources, with approximately 70% glycogen and 30% fatty acids contributing to ATP production.