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Skeletal muscles are a mosaic of the type I, type IIA, and type IIB fibers.

In muscle physiology, the anaerobic pathway typically runs out of fuel in less than a minute.

In living muscle, when myoglobin is oxidized (Fe2+ converts to Fe3+) a state called metmyoglobin, an enzyme reduces the cation back to Fe3+. Because the animal is alive, the levels of metmyoglobin are low at any given time. When a piece of beef sits in the refrigerator, the oxidation occurs but since the muscle is dead, the enzymatic reduction does not occur. After a few days, the levels of metmyoglobin increase. The color of the meat changes from red to:

Which energy-producing pathway in skeletal muscle is faster because it has fewer steps?

Which is correct about the breast indicated?

Which type of skeletal muscle fiber has the highest levels of fat (an excellent fuel source for aerobic cellular respiration)?

Which of the following statements is correct about type I fibers? Mark all that apply.

What acts as local reservoir for oxygen within a muscle cell and ensures mitochondria have the oxygen they need for ATP production?

Which skeletal muscle fiber is the thickest, whitest, and has the fastest contraction speed?  

On what human chromosome is the gene for myoglobin?