The dark color of red skeletal muscle (slow twitch muscle) can be attributed to a relative abundance of which of the following compared with white skeletal muscle (fast twitch muscle)?
A)Blood capillaries
B)Mitochondria
C)Myoglobin
D)Myosin adenosine triphosphatase
E)Oxidative enzymes

Question

Quizplus · Accepted Answer

The dark color of red skeletal muscle is due to the presence of myoglobin, which binds to oxygen and gives the muscle tissue a reddish color. Red muscle fibers have a greater abundance of myoglobin compared to white muscle fibers, which have lower levels of myoglobin and appear paler in color. Blood capillaries, mitochondria, myosin adenosine triphosphatase, and oxidative enzymes are all present in both red and white muscle fibers to varying degrees.

The Dark Color of Red Skeletal Muscle (Slow Twitch Muscle)