Renal Physiology Pdf Notes (2026 Update)

| Scenario (The Input) | Gate 1 (PCT) Effect | Gate 2 (TAL) Effect | Gate 3 (DCT) Effect | Gate 4 (CD) Effect | Final Urine Output | | :--- | :--- | :--- | :--- | :--- | :--- | | | ↑ Ammoniagenesis | No direct effect | No direct effect | ↓ pH (H+ secretion) | Acidic, Normal volume | | 2. Furosemide (Lasix) | Normal (65% Na reabsorbed) | BLOCKED (No NKCC2) → High Na+ delivered | Overwhelmed (Max NCC) | Max ENaC (Aldosterone surge) | High volume, High K+ loss | | 3. Aldosterone Antagonist (Spironolactone) | Normal | Normal | Normal | BLOCKED (No ENaC) → Na+ excreted, K+ retained | Normal volume, Low K+ | | 4. Severe Dehydration (Low GFR) | ↑ Max reabsorption (100%) | ↑ Reabsorption | ↑ Reabsorption | ↑ AQP2 (ADH) → Max water reabsorption | Low volume, Concentrated | | 5. SGLT2 Inhibitor (Diabetes drug) | BLOCKED (Glucose drags Na+ out) → Osmotic diuresis | Normal | Normal | Normal | High volume, Glucosuria | The "Interesting" Mechanistic Twist: The Countercurrent Detective The Feature within the Feature: A "Mystery Urine" puzzle.

This feature transforms a static page of facts into a dynamic, diagnostic reasoning tool. The Problem it Solves: Students memorize that "Loop diuretics act on the Na-K-2Cl cotransporter (NKCC2)" or "Aldosterone acts on the ENaC channel," but they fail to connect where a drug acts to what happens to the urine output or electrolyte panel. This feature forces spatial and temporal logic. renal physiology pdf notes