Some General Properties of Excitable Tissues

摘要: This chapter is about electrical signaling in cells, how it works, and may have evolved. All animal cells a membrane potential, specialized properties developed many. Axons, for example, serve as carriers of digital impulses over long distances. In heart the permeability are timing devices to control rate heartbeat. The contractile apparatus muscle fibers under control, activated when potential exceeds threshold value. Secretion transmitters, possibly hormones, triggered by changes. intestinal aids uptake glucose amino acids. uses cell electricity make an endless list, one moved ask all came about. Clearly, nature cannot foreseen these applications at outset, so why did potentials develop begin with? answer seems lie necessity osmotic equilibrium cells.(1)