Question

multiple choice question

what is the red oxygen-binding pigment found in the sarcoplasm of muscle cells called?

myofibril
glycogen
myoglobin

Explanation:

Identify the components of the sarcoplasm

Using the Sarcoplasm Components knowledge point

• Sarcoplasm is the cytoplasm of a muscle fiber.
• It contains abundant glycogen (for energy storage) and myoglobin (a red pigment).

Analyze the function of each option

• Myofibril: Long, cylindrical contractile organelles running parallel within the muscle fiber, not a soluble pigment.
• Glycogen: A complex carbohydrate used for glucose storage, not a red oxygen-binding pigment.
• Myoglobin: A red, globular protein that binds and stores oxygen within muscle cells, facilitating oxygen diffusion during sustained contraction.

Answer:

• Myofibril
• Glycogen
• Myoglobin (Correct answer)