Question

5. The cross bridges involved in muscle contraction are located on the
(A) Myosin myofilaments
(B) Actin myofilaments
(C) Tropomyosin
(D) Dystrophin
of hundles of thick filaments interleaved​

Answer 1

At high magnification, small bridgelike structures can be seen on the thick filaments extending toward the thin filaments in the overlap region.

Answer 2

The cross bridges involved in muscle contraction are located on the

(A) Myosin myofilaments

Explanation:

1.Thick myofilaments are comprised of around 300 spirally arranged protein molecules called myosin. Each myosin molecule is composed of two heavy chains and four light chains

2.The myosin heads are known as cross-bridges because they can bind to and move along actin in the thin filament. It is this actin-myosin interaction that is the molecular basis for force generation and movement in muscle cells.

3.The actin filaments are attached at their plus ends to the Z disc, which includes the crosslinking protein α-actinin. The myosin filaments are anchored at the M line in the middle of the sarcomere.