*💧 URINE FORMATION – HOW YOUR BODY MAKES PEE! 🚽🧠* *🔬 Takes place in the KIDNEYS – 3 main stages:* --- *1️⃣ FILTRATION (in the glomerulus):* • Blood enters the nephron • Waste, water, salts & small molecules are filtered from blood • Large proteins & cells stay in blood *➡️ What passes through becomes the *filtrate** --- *2️⃣ REABSORPTION (in the tubules):* • Useful substances like glucose, water, and salts are *reabsorbed* into the bloodstream • Body keeps what it needs --- *3️⃣ SECRETION:* • Additional wastes (e.g. urea, hydrogen ions) are *actively secreted* into the tubule • Helps maintain pH & electrolyte balance --- *🚰 Final product = URINE* • Water + urea + excess salts • Drains into bladder via ureters • Excreted through urethra --- *💡 Fun Fact:* Your kidneys filter about *50 gallons* of blood daily but only make about *1.5 liters* of urine! *Keep hydrated. Protect your kidneys.🩺*