Question

Which of the following sarcomeres is labelled correctly?

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

A sarcomere is composed of thick filaments made up of actin and myosin, respectively.

• A-band is the region where thick filaments are present.
• In the H-zone only thin filaments are present.
• I bands are the regions where thin bands are exclusively present.
• The Z-lines represent the boundaries between different sarcomeres.
• The M line divides the Z line in the middle and represents the regions where strands of protein myomesin are present.