Renin–Angiotensin–Aldosterone System (RAAS)
Posted inMedicine

Renin–Angiotensin–Aldosterone System (RAAS)

The JG cells detect crisis through three eyes: Baroreceptor eye → senses renal arterial pressure. Chemoreceptor eye (Macula densa) → monitors sodium chloride in distal tubule. Nerve eye → listens to sympathetic nerves releasing norepinephrine. When all scream “low!”, they release Renin. Note that Renin is not a hormone — it’s an enzyme. It cleaves angiotensinogen into action.
Signal Transduction Cascades
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Signal Transduction Cascades

What if I told you that a single molecule landing on your cell can trigger a chain reaction involving millions of other molecules within seconds? That's exactly what happens every…
Hepatocytes
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Hepatocytes

What if I told you there's a single type of cell in your body that acts like a chef, chemist, warehouse manager, security guard, and factory worker—all at the same…
Liver Sinusoids
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Liver Sinusoids

Have you ever wondered how your liver can grab toxins out of your blood? Imagine if your kitchen sink had magic hands that could reach into the flowing water and…
The Hepatic Portal System
Posted inMedicine

The Hepatic Portal System

What if I told you that everything you eat must pass through a sophisticated security checkpoint before entering your bloodstream? Meet the hepatic portal system—your liver's brilliant quality control network…