Question

Sarcomere is the part between

• A. 2 I bands
• B. 2 Z lines
• C. 2 A bands
• D. 2 H bands

Answer 1

The correct option is B 2 Z lines

Each skeletal muscle fiber is a skeletal muscle cell. Within each muscle fiber are myofibrils—long cylindrical structures that lie parallel to the muscle fiber. A myofibril is composed of many sarcomeres running along its length, and as the sarcomeres individually contract, the myofibrils and muscle cells shorten.
One sarcomere is the space between two consecutive Z discs.

I-band: The area adjacent to the Z-line, where actin myofilaments are not superimposed by myosin myofilaments.
A-band: The length of a myosin myofilament within a sarcomere.
H-band: The area adjacent to the M-line, where myosin myofilaments are not superimposed by actin myofilaments.