Physiology 2130 Chapter Notes -Myofibril, Stethoscope, Electrocardiography
19 Jan 2014
School
Department
Course
Professor
Document Summary
Contractile cells real muscle cells of heart and form most of the walls of atria and ventricles similar features to muscle fibers and contract in almost same way as skeletal muscle fibres contractile cells of heart have same contractile proteins actin and myosin arranged in bundles of myofibrils surrounded by sarcoplasmic reticulum contractile cells diff from skeletal muscle b/c have one nucleus and many more mitochondria!!!! Origin of self excitability almost all heart cells can spon gen action pot, but it is the sinoatrial node (sa node) that is the site of origin located in upper posterior wall of right atrium first to depolarize, prod. action potential aka pacemaker of heart, because prod action pot a lot from sa node, action potentials then travel to av node (atrial ventricular node) then to bundle of his then to purkinje fibers then finally to.
