Which muscle types have central nuclei?
Which muscle types have central nuclei?
The cardiac muscle cell has one central nucleus, like smooth muscle, but it also is striated, like skeletal muscle.
Does skeletal muscle have central or peripheral nuclei?
In transversely cut smooth muscle cells, observe the following points:
| Skeletal Muscle | Cardiac Muscle |
|---|---|
| Nuclei usually peripheral | Central nucleus |
| Unbranched | Branched |
| No intercalated discs | Intercalated discs |
| Longitudinal striation (myofibrils) | Longitudinal striation |
Why does cardiac muscle have central nuclei?
Cardiac muscle cells usually have a single (central) nucleus. The cells are often branched, and are tightly connected by specialised junctions. Gap junctions allow the muscle cells to be electrically coupled, so that they beat in synchrony.
What do nuclei do in skeletal muscle?
Many types of large cells have multiple nuclei. In skeletal muscle fibers, the nuclei are distributed along the cell to maximize their internuclear distances. This myonuclear positioning is crucial for cell function.
Why do skeletal muscle cells have so many nuclei?
Unlike most other cells in the body, skeletal muscle fibers are multinucleate— that is, they contain multiple nuclei. This is because, as described in chapter 1, each muscle fiber is a syncytial structure. That is, each muscle fiber is formed from the union of several embryonic myoblast cells.
Where is the nucleus in skeletal muscle?
Nuclei of skeletal muscle tissue are oval-shaped and located at the periphery of the cell. They are accompanied by satellite cells between the external lamina and sarcolemma . Satellite cells are precursors to skeletal muscle cells and are responsible for the ability of muscle tissue to regenerate.
Does a skeletal muscle cell have more than one nucleus?
Skeletal muscle is composed of long, fiber-like cells, which fuse together as they’re made. This means that each muscle cell has more than one nucleus because it is really made of several combined cells. Although cardiac cells have fewer nuclei than skeletal muscle cells, they are still considered multinucleated.
How many nuclei does skeletal muscle fiber contain?
Each skeletal muscle cell contains several hundred nuclei, as opposed to the single nucleus found in the cells of other muscle types. Muscle fibers have membranes as well as filaments called myofibrils , structures that are particularly important for their contractile function.