blood to capsular space
💧HUMAN ANATOMY STUDY GUIDE
Urinary System and Fluid Balance
Study nephron filtration, reabsorption, secretion, urine concentration, and hormonal control of water and ions.
8 key ideas8 flashcards5 practice questions
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Urine equals what was filtered, minus what returned, plus what was secreted.
tubule back to blood
blood into tubular fluid
Key ideas to know
Start with the relationships between ideas. Then close the notes and explain each one from memory.
- 01
Kidneys filter blood, regulate fluid and ion balance, remove wastes, and participate in pressure and red-cell control.
- 02
A nephron contains a renal corpuscle and a renal tubule.
- 03
Glomerular filtration moves water and small solutes from blood into the capsular space.
- 04
Tubular reabsorption returns needed material from filtrate to blood.
- 05
Tubular secretion moves selected material from blood into tubular fluid.
- 06
The loop of Henle helps establish the medullary gradient used to concentrate urine.
- 07
Antidiuretic hormone raises collecting-duct water permeability.
- 08
Aldosterone increases sodium reabsorption and potassium secretion in distal nephron segments.
PART OF THE HUMAN ANATOMY GUIDE
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Open the full Human Anatomy guide →Two ideas worth correcting now
NOT QUITE
→Urine is filtered blood with cells removed
USE THIS INSTEAD
Tubules extensively reabsorb and secrete material after filtration.
NOT QUITE
→ADH directly adds water to blood
USE THIS INSTEAD
It raises collecting-duct permeability so water follows an osmotic gradient.
Flashcards
Answer before opening each card. The effort to retrieve is part of the learning.
1What forms the renal corpuscle?Show answer ＋
The glomerulus and glomerular capsule.
2What is filtration?Show answer ＋
Movement of water and small solutes from glomerular blood into capsular space.
3What is reabsorption?Show answer ＋
Return of material from tubular fluid to blood.
4What is secretion?Show answer ＋
Transfer of selected material from blood to tubular fluid.
5Where is most filtered material reabsorbed?Show answer ＋
The proximal convoluted tubule.
6What does ADH do?Show answer ＋
Raises water permeability in collecting ducts.
7What does aldosterone do?Show answer ＋
Raises sodium reabsorption and potassium secretion.
8What carries urine from kidney to bladder?Show answer ＋
The ureter.
Explain it in your own words
Use the answer as a check after you have written or spoken your response.
01Why are blood cells normally absent from filtrate?
The filtration barrier retains cells and most large proteins in the bloodstream.
02How does the loop of Henle assist concentrated urine formation?
Opposing limb properties establish a medullary osmotic gradient used by collecting ducts.
03What happens when ADH is low?
Collecting ducts reabsorb less water, producing a larger amount of dilute urine.
04How does the renin-angiotensin-aldosterone system raise pressure?
It promotes vasoconstriction, sodium retention, and water retention.
05Why can glucose appear in urine when blood glucose is very high?
Filtered glucose can exceed transporter capacity in the proximal tubule.
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