Skeletal muscle structure Quiz
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5 questions, one answer each
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1. Which statement about the skeleton and muscles is correct?
- A. Muscles push bones, and the skeleton is compressible
- B. Muscles pull bones, and the skeleton is incompressible
- C. Muscles pull bones, and the skeleton is compressible
- D. Muscles push and pull, and the skeleton is incompressible
2. Which part of a muscle fibre stores calcium ions?
- A. Sarcolemma
- B. Mitochondrion
- C. Sarcoplasmic reticulum
- D. T-tubule
3. Which band contains only actin filaments?
- A. A band
- B. H zone
- C. M line
- D. I band
4. A sarcomere is 2.6 µm long and its A band is 1.7 µm long. What is the total length of I band material?
- A. 0.9 µm
- B. 0.45 µm
- C. 1.7 µm
- D. 4.3 µm
5. Which feature is typical of fast skeletal muscle fibres?
- A. Large amounts of myoglobin
- B. A rich capillary supply
- C. Many mitochondria
- D. A large store of phosphocreatine