Examples of myofilament in the following topics:
-
- Actin myofilaments
attach directly to the Z-lines, whereas myosin myofilaments attach via titin
molecules.
- Surrounding the Z-line is the
I-band, the region where actin myofilaments are not superimposed by myosin
myofilaments.
- Another protein, nebulin, is thought to perform a similar role for
actin myofilaments.
- During muscle contraction, the heads of myosin myofilaments quickly bind
and release in a ratcheting fashion, pulling themselves along the actin
myofilament.
- The myofilaments themselves do not contract or expand and so the A-band remains
constant.
-
- Skeletal muscles are composed of striated subunits called sarcomeres, which are composed of the myofilaments actin and myosin.
- Myofibrils are composed of long myofilaments of actin, myosin, and other associated proteins.
- Myofibrils are composed of smaller structures called
myofilaments.
- There are two main types of myofilaments: thick filaments and thin
filaments.
- The molecular model of contraction which describes the
interaction between actin and myosin myofilaments is called the cross-bridge
cycle.
-
- Muscle cells,
or myocytes, contain myofibrils comprised of actin and myosin myofilaments
which slide past each other producing tension that changes the shape of the
myocyte.