Question

Which of the following statements is true?

1) Cardiac muscle cells have many nuclei.
2) Smooth muscle cells have T tubules.
3) Striated muscle cells are long and cylindrical with many nuclei.
4) Cardiac muscle cells are found in the heart and large blood vessels.

Answer 1

The true statement is that striated muscle cells (Option 3) are long and cylindrical with many nuclei, referring to skeletal muscle. Cardiac muscle cells have a single centrally located nucleus and are found only in the heart, while smooth muscle cells are spindle-shaped with a single nucleus and no T tubules.

Step-by-step explanation:

You are correct in identifying the true statement about muscle cells: Option 3, 'Striated muscle cells are long and cylindrical with many nuclei.' This statement refers to skeletal muscle cells, which are indeed long, cylindrical, and multinucleated, with the nuclei situated peripherally within the cell. In contrast, cardiac muscle cells, which are found only in the heart, are shorter, branched, striated, and usually have a single centrally located nucleus, although some may have two or more. Smooth muscle cells do not contain T tubules and are spindle-shaped with a single nucleus.