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.
That's because cancer cells are essentially modified self cells. That means the immune system usually doesn't recognize them as harmful. The immune response is triggered only in certain types of cancer -- when cancer cells become so highly abnormal that they are recognizable as nonself cells.