Question

Which major factors determine the oxidative capacity of muscle? a) Fiber type and diameter b) Blood flow and oxygen concentration c) Mitochondrial density, Enzyme content, and Blood flow d) Glycogen stores and ATP production

Answer 1

The major factors that determine the oxidative capacity of muscle include fiber type and diameter, blood flow and oxygen concentration, and mitochondrial density, enzyme content, and blood flow.

Step-by-step explanation:

The major factors that determine the oxidative capacity of muscle include:

1. Fiber type and diameter: Slow oxidative (SO) fibers have a large number of mitochondria, produce low power contractions, and are slow to fatigue. Fast glycolytic (FG) fibers have a large diameter, produce powerful contractions, and fatigue quickly.
2. Blood flow and oxygen concentration: SO fibers are extensively supplied with blood capillaries to supply oxygen from the red blood cells in the bloodstream. This allows for a higher concentration of oxygen in the muscle.
3. Mitochondrial density, Enzyme content, and Blood flow: SO fibers possess a large number of mitochondria and enzymes involved in aerobic metabolism, which allows them to produce large amounts of ATP. Additionally, the high blood flow to SO fibers helps supply oxygen and nutrients.

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