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🫘 How do kidneys filter blood?

Nephrons filter, reabsorb, and secrete — then hormones tune pressure, water, and chemistry.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Filters the size of a fingerprintDescribe nephrons and glomerular filtration barriers.Kidneys process blood continuously via ~million nephrons each. Glomeruli filter small solutes under pressure while keeping cells and most proteins.
Reclaim, secrete, concentrateExplain reabsorption, secretion, and concentrating ability.Most filtrate is reclaimed. Secretion adds discards. Medullary gradients plus ADH let you make concentrated or dilute urine.
Hormones and long-game balanceConnect kidneys to pressure, water, and systemic chemistry.Renin cascades, ADH, EPO, and ion/pH handling make kidneys endocrine and regulatory organs — not mere waste pipes.

Questions this course answers

What is the glomerulus mainly doing?

The glomerular capillary tuft filters a plasma-like fluid into Bowman’s capsule; cells and most large proteins remain in the blood.

Match each process to its direction

Nephrons filter broadly, then reabsorb and secrete to craft final urine before excretion.

Why are kidneys more than simple waste filters?

Beyond dumping urea, kidneys regulate volume, pressure pathways (e.g. renin cascade), ADH-guided water recovery, EPO, and acid-base/potassium balance.

Grounded in trusted sources

National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) kidney education
American Physiological Society / textbook nephron physiology summaries
National Kidney Foundation public science explainers
Open educational anatomy & physiology resources on glomerular filtration and tubular function

Every Wunder lesson is built from real, reputable sources — never invented.

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