See It · The Urinary System

Urinary Lab

Run a nephron, change the filtration pressures, trace molecules, and break the kidney on purpose. Nothing here is graded.

Part 1: Nephron Simulator

WaterNa⁺Glucose UreaProtein (stays in blood)Blood cell (stays in blood)

Urine volume (L/day)Urine concentration (mOsm)GFR (mL/min)

Controls

Hydration (sets ADH)

Aldosterone

Blood glucose

Mean arterial pressure

Live readouts

Challenges

Teaching model: numbers are rounded, time is sped up, and particle counts are exaggerated. In a real body, low blood pressure would also switch on RAAS and ADH by itself; here you set them by hand.

Part 2: Filtration Pressure

GBHP pushes outCHP pushes backBCOP pulls inFiltrate

Pressures (mmHg)

GBHP: blood pressure in glomerulus

CHP: capsule pushes back

BCOP: protein pull

Predict, then watch

1. Which pressure changes?

2. What happens to NFP and GFR?

The pressures change instantly here. In a real kidney, autoregulation would partly push GFR back toward normal.

Part 3: Urine's Journey

0:00 Relaxed mode (timer hidden)

Drag a card, use the ▲ ▼ buttons, or tap one card and then tap another to swap them.

Pick a molecule

Wrong answers are fine here. Read why, then try again.

1. What part of the urinary system is affected?

2. What happens to the urine?

Wrong answers are fine here. Read why, then try again.

Dr. Akash Garg · See It: Anatomy & Physiology · Chapter 25, The Urinary System (OpenStax Anatomy & Physiology 2e) · Learn the steps first in the Urinary System Walkthrough.
Simplified teaching models: values are rounded textbook numbers, time is sped up, particle counts are exaggerated, and diagrams are not to scale. Clinical cases are simplified for learning and are not medical advice.