Which of the following are present in high densities in both smooth and skeletal muscle cells?
I.cilia
II.mitochondria
III.nuclei
IV.endoplasmic reticulum

Question

Quizplus · Accepted Answer

Smooth muscle cells and skeletal muscle cells both require high levels of energy production to support their contractile function, therefore, both have high densities of mitochondria. However, smooth muscle cells have much smaller nuclei than skeletal muscle cells, and do not have cilia. Both cell types do have endoplasmic reticulum, but the smooth muscle cell has a greater proportion of smooth endoplasmic reticulum, which plays a role in calcium regulation during muscle contraction. Therefore, only choice II and IV are present in high densities in both cell types.

Which of the Following Are Present in High Densities in Both