BIOL 120 Lecture Notes - Lecture 16: Vagus Nerve, Resting Potential, Atrioventricular Node
Document Summary
There are no nerve fibers in your heart only modified cardial cells. These cells are like actin and myosin (they contract) The nervous system of the heart no neurons contains modified myocardial cells that act like neurons but cannot contract only generating and conducting action potential. Begins in the sa node (roof of right atrium): the natural pacemaker. Will branch into these fibers which will bring the signal to all of the atrical myocardial cells (internoval fibers). The internoval fibers will bring the signal to the av node (base of right atrium) Branches will merge upwards into purkinje fibers in apex of heart. Innovate myocardial cells and they propagate action. Can depolarize on its own - 110 spontaneous deplorization. Don"t propagate action potential, send signal to internodal fibers that propagate action potential to atriomyocardial cells which causes the atria to contract.
