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
Tissue bank it is for transplant and/or therapy. The American Association of Tissue Banks (AATB) is the most recognized accrediting body for American tissue banks. At the first European Conference on Problems of Tissue Banking and Clinical Applications, held in Berlin on Oct 24-26, 1991, many European countries joined together to adapt common practices regarding tissue banks and the European Association of Tissue Banks was created. Body brokers are firms or individuals that buy and sell cadaver human body parts for use of research. Trade in these body parts is performed in a manner similar to other raw materials, though many brokers