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.
Yes, calcium is necessary for the release of neurotransmitters that cause a muscle to initiate a contraction. Calcium is also needed to bind to the troponin-tropomyosin comple â¦ x causing it to change position so the myosin head can attach to the actin molecule which results in contraction.alcium is also needed to bind to the troponin-tropomyosin comple â¦ x causing it to change position so the myosin head can attach to the actin molecule which results in contraction.