Depolarization in Sinus Rhythm: In normal sinus rhythm, depolarization originates in the SA node and spreads uniformly through the atria and ventricles, resulting in coordinated heartbeats seen as distinct P, QRS, and T waves on an ECG.
Renin Angiotensin Aldosterone Pathway: This hormonal cascade begins with renin release from the kidneys, leading to the formation of angiotensin II, a potent vasoconstrictor, and the secretion of aldosterone, which promotes sodium and water retention.
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