Kidney & Water Balance
How the nephron filters plasma and reclaims what the body needs, and how water balance is defended: osmosis and tonicity at the cell membrane, ADH and thirst, glucose recovered at the SGLT2 transporter, the bladder filling and emptying, and the chemistry by which a kidney stone crystallises.
Every page here is a hands-on animated diagram, not a video — press play, slow it down, break the mechanism on purpose, and read the live values in real clinical units. They explain how a process works; they are not medical advice, and the evidence for any treatment lives on the topic pages each animation links into.
Table of Contents
The Animations (6)
Kidney Nephron
Follow blood into the glomerulus and see filtration and reabsorption turn 180 litres of filtrate into urine — then toggle dehydration or diabetes and watch it change.
Launch animation →Thirst, ADH & How Your Body Guards Its Water
Get dehydrated and watch osmoreceptors fire thirst and ADH, opening aquaporins so the kidney reclaims water — then drink too much, or lose ADH in diabetes insipidus, and watch the urine run clear.
Launch animation →Osmosis & Tonicity: Why Cells Swell or Shrink
Drop a cell into salty or plain water and watch it shrivel or swell to bursting as water chases solute — then see why an IV bag has to be mixed to just the right strength.
Launch animation →SGLT2: Why Diabetes Drugs Make You Pee Sugar
Watch the kidney reclaim every gram of glucose — until blood sugar passes the threshold and it spills into the urine, or an SGLT2-inhibitor drug dumps it there on purpose.
Launch animation →How Kidney Stones Form (and How to Prevent Them)
Watch minerals in concentrated urine crystallize and clump into a stone — then feel it drop into the ureter and block it (the worst pain there is), and learn why water and calcium actually prevent them.
Launch animation →How You Pee: The Bladder & Its Reflex
Fill the bladder, feel the urge build, then release the micturition reflex to void on command — and see why infants can’t hold it, why the prostate weakens the stream, and what an overactive bladder does.
Launch animation →