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🫘 How the Kidney Filters Blood

Follow blood through the glomerulus and nephron as pressure, reabsorption, secretion, and dialysis shape what leaves the body as urine.

lessons

~20 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

The kidney's jobIdentify the nephron and distinguish blood, filtrate, and urine.Kidneys process blood through millions of nephrons; filtration is only the first edit.
Pressure drives filtrationExplain how local pressure and barrier properties drive glomerular filtration.A net pressure gradient across a selective barrier creates filtrate, while autoregulation buffers change.
The tubule edits the filtrateDescribe reabsorption, secretion, concentration, and final urine formation.Tubules recover useful substances, add selected wastes, and tune water, salts, and acid.
Dialysis replaces selected kidney workCompare hemodialysis and peritoneal dialysis with nephron function.Dialysis uses membranes, concentration gradients, and pressure to replace crucial clearance and fluid removal, not every kidney role.

Questions this course answers

What is the nephron?

Each nephron combines a glomerulus with a tubule to filter and edit fluid.

Why is filtrate not yet urine?

The initial filtrate is edited extensively before final urine exits.

Put the filtration sequence in order.

Flow, pressure, barrier passage, and tubular delivery form the opening sequence.

Which force directly favors glomerular filtration?

Glomerular capillary hydrostatic pressure pushes fluid toward Bowman's space.

What does GFR describe?

GFR estimates whole-kidney glomerular filtration per unit time.

Put these tubular actions in a useful order.

The tubule combines recovery and secretion before excretion.

Grounded in trusted sources

National Institute of Diabetes and Digestive and Kidney Diseases, Your Kidneys & How They Work, https://www.niddk.nih.gov/health-information/kidney-disease/kidneys-how-they-work
National Institute of Diabetes and Digestive and Kidney Diseases, Measuring How Well the Kidney Works—One Nephron at a Time, https://www.niddk.nih.gov/news/archive/2017/measuring-how-well-kidney-works-one-nephron-time
Blantz RC and Gabbai FB, Glomerular hemodynamics in pathophysiologic conditions, American Journal of Hypertension, https://pubmed.ncbi.nlm.nih.gov/2684227/
National Kidney Foundation, Hemodialysis: How It Works, Types, and What to Expect, https://www.kidney.org/kidney-topics/hemodialysis
National Institute of Diabetes and Digestive and Kidney Diseases, Peritoneal Dialysis, https://www.niddk.nih.gov/health-information/kidney-disease/kidney-failure/peritoneal-dialysis
National Kidney Foundation, Ultrafiltration, https://www.kidney.org/kidney-topics/ultrafiltration
Wikimedia Commons MediaWiki API, imageinfo with iiurlwidth=960, https://commons.wikimedia.org/w/api.php

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