Question

Read the following statements.

1. Bands are dark bands and contain myosin
2. I bands are light bands and contain actin
3. During muscle contraction, the A band contracts.
4. The part between the two Z - lines is called a sarcomere.
5. The central part of the thin filament, not overlapped by the thick filament is called Hzone.

Of the above statements   

Options

• i, ii and iii are correct, while iv and v are incorrect. 

• i, iii, v are correct, while ii, iv are incorrect. 

• i and ii are correct, while iii, iv and v are incorrect

• i, ii and iv are correct, while iii and v are incorrect.

Answer 1

i, ii and iv are correct, while iii and v are incorrect.

Explanation:

1. When a muscle contracts, a band maintains its length, and the I band contracts.
2. Hzone refers to the centre of a thick filament that is not covered by a thin filament.