A group of cells called the sinus node is the natural pacemaker of the heart and controls the heartbeat. Sinus node dysfunction is one source of the medical condition known as heart arrhythmia: irregular heartbeat. Significant arrhythmias are treated in several ways, including the use of an artificial pacemaker, which is an electrical device that sends the signals needed to make the heart beat properly. Research how both natural and artificial pacemakers operate to achieve their goal of maintaining a regular heartbeat.Place your findings in a memorandum that includesannotated sketches of each type of pacemaker.
Lecture 5 Tuesday, September 20, 20110:48 AM Lecture 4 continued: • Prions- proteins that can produce proteinaceousinfectiousparticles ○ Cause mad cow disease ○ Transmissible, no nucleic acid component,species barriers ○ Protein present in normal cells ○ Nobel prize won by Stanley Pruisner ○ Ex- amyloid fibers associated with alzheimer's ○ Conversion of normal protein into abnormal form, ability to aggregate ○ Disturb formation of alpha helices ○ May help us understandalzheimer's, parkinson's, ALS • Spongiform encephalies: ○ Formation of protein aggregates/ plaques, leads to lysosomal lysis and holes in the tissue Lecture 5: • The steady state level/ concentration of a protein is a function of
