wunder beta

📘 How kidneys filter blood

Follow nephrons, glomerular filtration, tubular reabsorption, secretion, and urine concentration.

lessons

~20 min

to learn

🔬 Science

subject

Adults

level

Start the course →

What you’ll learn

Kidney role
Nephron
Glomerulus
Filtrate
Proximal tubule
Loop
Distal tubule
Collecting duct
Secretion
GFR
Water balance
Electrolytes
Acid-base
Urine path
Feedback
Final product

Questions this course answers

What is the glomerulus?

The glomerulus filters water and small molecules into Bowman’s capsule.

Why is filtered glucose normally absent from urine?

Healthy proximal tubules reclaim nearly all filtered glucose.

What are the three major urine-formation processes?

Nephrons combine these processes to create final urine.

What can antidiuretic hormone change?

Hormonal water permeability controls urine concentration.

Why does a high GFR not equal high urine volume?

Tubular recovery returns most filtrate to the blood.

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