Question

Pick out the number of correct statements regarding muscle contraction-
i) length of $a$ band remains
ii) length of $i$ band decreases
iii) $Z$ line are pulled to centre
iv) $M$ line are remaining same

• A. $2$
• B. $3$
• C. $4$
• D. $5$

Answer 1

The correct option is C $4$

1. The length of A band remains constant.

2. The length of I band decreases as actin filaments are pulled over Myosin.

3. Z line representing the centre of I band are pulled towards centre.

4. The M line in the middle of H zone remain unaltered.

So, the correct option is '4'.