This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
In muscle contraction all of the following occurs except 
Select and explain. 
A. Z-lines become closer, B. H zone diappears, C. A band shortens, D. M line becomes more prominent
C: A band shortens
Answer: C: A band shortens 
Explanation: In muscle contraction

Z-line become closer
Sarcomere shorten
A-band remains unchanged
H-zone disappears
I-band shortens
M line becomes more prominent