This is an issue that deserves attention, as research examining iron levels in Americans shows that more people have iron levels that are considered too high, than levels that are deficient. In one study of more than 1,000 people, only 3 percent were iron deficient, but 13 percent had iron overload. 1. What are the Health Risks of Too Much Iron?
Think rigid. Rigidity is a condition of hardness, stiffness or inflexiblity. You find this with muscle contractures. Now think spastic. Spasticity is a form of muscular hypertoncity (excessive muscle tone) with increased resistance to stretching. It usually occurs in the flexor muscles of the arms and legs. You would see movement that requires greater effort and with a lack of control and coordination.
However, their major difference is that the skeletal muscle is controlled by the somatic nervous system, and the cardiac muscles are, by nature, involuntarily controlled. Besides their overall different locations within the body, these two muscles also have many differences in their cellular structures..Unlike the skeletal muscles, there are gap junctions in the cardiac muscles, and their contractions function independently from each other. 6.There are only one or two nuclei in the cardiac muscle cells, while the skeletal muscle cells are multi-nucleated.