Which valves are most commonly affected by infective endocarditis?
Aortic and Mitral Valves
Aortic and Tricuspid Valves
Tricuspid and Mitral Valves
What is the name of the muscle found in the atrium
There are specialised types of cardiac muscle cell. The contractile cells, composing of cardiac muscle cells and the auto-rhythmic cells, which initiate and conduct for contraction of working cells.
The SA node, is always in transient state towards hyperpolarisation. This causes activation of the funny Na+ channels allowing an influx of Na+. K+ channels close slowly allowing threshold to be reached. The next step is?
Closing of Na+ channels and opening of transient calcium channels
Opening of transient Na+ channels and opening of transient calcium channels
The auto-rhythmic cells of the SA node set the pace of the heart at 70-80
100-120( 70-80, 80-100, 100-120 ) BPM, in the presence of parasympathetic tone. These cells have the fastest rhythm at controlling heart rate. The cells of the AV node are slower
faster( slower, faster ) and set a rhythm of 40-60BPM
100BPM( 60BPM, 100BPM ).