This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Muscle Physiology, Subject name: Physiology
In muscle contraction all are true except 
Select and explain. 
A. A bond remains unchanged, B. H zone disappears, C. I band becomes wider, D. Two Z line come closer
C: I band becomes wider
Answer: C: I band becomes wider 
Explanation: Ans. (c) I band becomes wider(Ref: Ganong, 25th ed/p.100)When muscle contracts,#Z lines come closer#Length of H and I band decrease#Length of A band remains constant