Question

Which mechanism describes the formation of multinucleated skeletal muscle fibers?

Answer 1

Multinucleated skeletal muscle fibers are formed by the fusion of embryonic myoblasts, each contributing its nucleus to the mature muscle fiber, resulting in a cell with many nuclei. This aids in the production of the large amounts of proteins necessary for muscle function. Cardiac and smooth muscle cells do not become multinucleated because the myoblasts do not fuse.

Step-by-step explanation:

The formation of multinucleated skeletal muscle fibers is described by the mechanism in which myoblasts, which are embryonic muscle-forming stem cells, fuse together. Early in development, embryonic myoblasts, each with its own nucleus, merge to form mature muscle fibers. This process ensures that each nucleus from the contributing myoblasts is preserved within the mature muscle fiber, giving rise to a muscle cell with many nuclei or a multinucleated structure. Since skeletal muscle fibers require the manufacture of significant amounts of proteins and enzymes for muscle contraction, having multiple nuclei allows for the production of large quantities of these molecules. Unlike skeletal muscle, cardiac and smooth muscles are not multinucleated because myoblasts do not undergo fusion during their formation.

Answer 2

Multi nucleated skeletal fibers are formed by the FUSION OF MONO NUCLEATED MYOBLASTS.
The myoblast are made up of only one nucleus in their cells, that is why they are described as mono nucleated. When mono nucleated cells fuse together they form multi nucleated fibers which is ribbon like in shape.