MCAT Biology Question 152: Answer and Explanation
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Question: 152
2. 
Region 1 refers to:
- A. the thick filaments only.
- B. the thin filaments only.
- C. the A-band.
- D. the I-band.
Correct Answer: C
Explanation:
Region 1 contains both thick and thin filaments overlapping one over the other. This region refers to the A-band and is measured from one end of the thick filaments to the other. This is also the only portion of the sarcomere that does not change length during muscle contraction.