Renal Physiology Cheat Sheet

Key Definitions

• Nephron: Functional unit of the kidney responsible for urine formation. ✅

• Glomerulus: Network of capillaries where filtration occurs. ✅

• Bowman's Capsule: Structure surrounding the glomerulus; collects filtrate. ✅

• Tubules: Sections of nephron (proximal, loop of Henle, distal) for reabsorption and secretion. ✅

Important Concepts

Filtration and Reabsorption

• Filtration: Blood plasma filtered into Bowman's capsule; driven by hydrostatic pressure. ✅

• Reabsorption: Selective movement of substances from tubules back to blood; occurs mainly in the proximal tubule. ✅

Regulation of Blood Pressure

• Renin-Angiotensin-Aldosterone System (RAAS): Hormonal mechanism regulating blood pressure and fluid balance. ✅

Acid-Base Balance

• Bicarbonate Buffer System: Primary system for maintaining pH in blood. ✅

Key Formulas

• GFR: Glomerular Filtration Rate

• Kf: Filtration coefficient

• Pgc: Glomerular capillary hydrostatic pressure

• Pbs: Bowman's capsule hydrostatic pressure

• πgc: Glomerular capillary oncotic pressure

Common Mistakes to Avoid

Common Mistake: Confusing the roles of the proximal tubule and distal tubule in reabsorption.

Memory Tricks

Tip: "FAT B" —

• Filtration

• Acid-base balance

• Tubular reabsorption

• Blood pressure regulation

Key Diagrams

   Glomerulus
      |
      |
  Bowman's Capsule
      |
      |--- Proximal Tubule
      |       |
      |       |--- Loop of Henle
      |       |
      |--- Distal Tubule
      |
    Collecting Duct