Question

What is sarcomere?

• A. part between two H-line
• B. part between two A-line
• C. part between two I-band
• D. part between two Z-line.

Answer 1

Answer: (D)

part between two Z-line.

Answer 2

Sarcomere is the part between two Z lines.It is the fundamental structural and functional unit of the muscle contraction.The repeating units of sarcomere make up the myofibrils.It has a thin filament (actin), thick filament (myosin).There are zones: a band is the region that has both thick and thin filament.I band only has thin filament and is lighter in appearance.H zone is the region with only thick filament and M line is in the centre of the sarcomere.