Which of the following is NOT found in skeletal muscle fibers in humans?
Correct answer: D. Large amount of hemoglobin
- A. Multiple nuclei
- B. Multiple mitochondria
- C. Large amount of myoglobin
- D. Large amount of hemoglobin
Explanation
Skeletal muscle fibers in humans do not contain a large amount of hemoglobin. Haemoglobin is a protein found in red blood cells that is responsible for transporting oxygen throughout the body. While skeletal muscle fibers have a rich blood supply to support their metabolic needs, they do not typically contain a significant amount of hemoglobin within the fibers themselves.
This question appeared on the UHS MDCAT 2022 paper, which you can sit online with every answer explained.
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Muscles covers skeletal, smooth and cardiac muscle, their microscopic structure and the roles of tendons, myofibrils, actin and myosin. It explains the sliding filament mechanism, sarcomere shortening, neuromuscular transmission and calcium regulation, while distinguishing voluntary skeletal movement from involuntary contraction in smooth and cardiac muscle.
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