Humans have three different kinds of muscle: 1  Skeletal muscle is attached to bone, mostly in the legs, arms, abdomen, chest, neck, and face. Skeletal muscles are called striated because they are made up of fibers that have horizontal stripes when viewed under a microscope. These muscles hold the skeleton together, give the body shape, and help it with everyday movements (known as voluntary muscles because you can control their movement). They can contract (shorten or tighten) quickly and powerfully, but they tire easily and have to rest between workouts.
Cancer cells have a number of abnormal characteristics that prevent them from functioning in the same manner as normal cells. They divide repeatedly and form tumors in the place of origin and in other parts of the body.Cancer is actually over a hundred different diseases.ancer Cells Lack Differentiation Cancer cells are nonspecialized and do not contribute to the functioning of a body part. Cancer Cells Have Abnormal Nuclei The nuclei of cancer cells are enlarged and may contain an abnormal number of chromosomes.
Cancer Cell Properties. Cancer cells have characteristics that differ from normal cells. 1  Cell Reproduction: Cancer cells acquire the ability to reproduce uncontrollably. 2  These cells may have gene mutations or chromosome mutations that affect the reproductive properties of the cells. Normal cells reproduce properly. 2  Except for sex cells, all cells of the body reproduce by mitosis. 3  Sex cells reproduce through a process called meiosis. 4  Cell Communication: Cells communicate with other cells through chemical signals. 5  These signals help normal cells to know when to reproduce and when to stop reproducing.