Part 5 · Cardiovascular Physiology
Same concept, other depth: Foundation →
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Cardiac properties: automaticity (nodal, junctional, Purkinje cells), excitability, conductivity (gap junctions — connexin 43 in working myocardium, connexin 40/45 in conduction tissue), contractility, and a long effective refractory period that lasts nearly until relaxation — so summation and tetanus are impossible and the ventricle always refills.
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