What is the red pigment in the sarcoplasm that stores oxygen?

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Study for the Ivy Tech APHY 101 Muscle System Test. Dive into comprehensive questions with clear hints and explanations, boosting your confidence for the exam!

Multiple Choice

What is the red pigment in the sarcoplasm that stores oxygen?

Explanation:
That pigment is myoglobin. It’s an iron-containing protein in the muscle cell’s sarcoplasm that binds and stores a small amount of oxygen, keeping it ready for mitochondria during contraction when blood flow can’t meet immediate demand. This helps sustain ATP production as activity rises. The reddish color comes from the iron in its heme group, and each myoglobin molecule can hold one oxygen molecule. The other proteins—myosin, actin, and tropomyosin—are involved in contraction mechanics and regulation, not oxygen storage.

That pigment is myoglobin. It’s an iron-containing protein in the muscle cell’s sarcoplasm that binds and stores a small amount of oxygen, keeping it ready for mitochondria during contraction when blood flow can’t meet immediate demand. This helps sustain ATP production as activity rises. The reddish color comes from the iron in its heme group, and each myoglobin molecule can hold one oxygen molecule. The other proteins—myosin, actin, and tropomyosin—are involved in contraction mechanics and regulation, not oxygen storage.

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