Question

Unlike skeletal muscle, where muscle fibers are multinucleated cells, cardiac muscle fibers are composed of multiple cells that make tight end-to-end connections. Cardiac muscle cells may split and unite, giving cardiac muscle a typical "branching" morphology. Cardiac and skeletal muscles both exhibit cross-striations–their thick and thin contractile filaments exhibit the same organization. The nuclei of cardiac and skeletal muscle are, however, distinctly different. The nuclei of skeletal muscle cells are located at the periphery of the fiber, whereas the nucleus of a cardiac myocyte is located in the center of the cell. This difference in nuclear location provides a useful means for distinguishing cardiac from skeletal muscle. Cardiac and skeletal muscle fibers are both invested with connective tissue that conveys nerves and capillaries. Which of the following statements is true regarding the differences between cardiac and skeletal muscle?

1) Cardiac muscle fibers are multinucleated cells, while skeletal muscle fibers are composed of multiple cells.
2) The nuclei of skeletal muscle cells are located at the periphery of the fiber, whereas the nucleus of a cardiac myocyte is located in the center of the cell.
3)ardiac and skeletal muscles both exhibit cross-striations.
4) Cardiac muscle fibers are composed of multiple cells that make tight end-to-end connections.
5) Cardiac and skeletal muscle fibers are both invested with connective tissue that conveys nerves and capillaries.

Answer 1

The differences between cardiac and skeletal muscle include the composition of muscle fibers, the location of nuclei, and the presence of cross-striations.

Step-by-step explanation:

The correct statement regarding the differences between cardiac and skeletal muscle is:

1. Cardiac muscle fibers are composed of multiple cells that make tight end-to-end connections.
2. The nuclei of skeletal muscle cells are located at the periphery of the fiber, whereas the nucleus of a cardiac myocyte is located in the center of the cell.
3. Cardiac and skeletal muscles both exhibit cross-striations.

Cardiac muscle fibers are composed of multiple cells that connect tightly to each other, allowing the heart to contract as one unit. In contrast, skeletal muscle fibers are individual multinucleated cells. Both cardiac and skeletal muscles have cross-striations, which refer to the organization of their contractile proteins.