Each physical or health hazard is a âhazard classâ (e.g., Carcinogenicity is a hazard class). A âhazard classâ may be sub-divided in the criteria into. several âhazard categoriesâ based on the degree of. severity of the hazard.
Quick Answer. Calcium is a crucial part of muscle contraction. The ionic element is released from muscles during contraction and relaxation. The release of calcium helps propagate the muscle contraction and relaxation stages. Continue Reading.
How do calcium ions initiate contraction in skeletal muscle fibers? A. Calcium ions provide the energy necessary for the myosin head power stroke. B. Calcium ions bind to tropomyosin, exposing the active sites on actin. C. Calcium ions bind to troponin, changing troponinâs shape.