Systole heart beats—is cued by messages from the brain, reflecting the brain's responses to conditions of the body, such as pain, emotional stress, level of activity, and to ambient conditions including external temperature, time of day, etc. Electrical systole opens voltage-gated sodium, potassium and calcium channels in cells of myocardium tissue. Subsequently, a rise in intracellular calcium triggers the interaction of actin and myosin in the presence of ATP which generates mechanical force in the cells in the form of muscular contraction, or mechanical systole. The contractions generate intra-ventricular pressure, which is increased until it exceeds the external, residual pressures in
American Association of Tissue Banks The AATB also accommodates accreditation to non-transplant tissue banks and whole body donation programs. To avoid violating the Health Insurance Portability and Accountability Act, AATB must through their legal anatomical authorizations obtain consent which allows AATB representatives access to donor information for accreditation reviews. American Association of Tissue Banks The American Association of Tissue Banks (AATB); a transplant trade organization that is dedicated to ensuring that human tissues intended for transplantation are safe and free of infectious disease, of uniform high quality, and available in quantities sufficient to meet the needs of the national. The AATB provides accreditation for over