MCAT Biology Question 153: Answer and Explanation
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Question: 153
3. 
Which region represents one sarcomere?
- A. 1
- B. 2
- C. 3
- D. 4
Correct Answer: D
Explanation:
The sarcomere is the contractile unit in striated muscle cells. One sarcomere is represented by the area between the two vertical lines, referred to as the Z-lines. In addition, the Z-lines anchor the thin filaments. In the diagram, a sarcomere is therefore defined by region 4.