Urine Formation
Biology 314 with Freymiller at University of Wisconsin - Eau Claire
About this deck
By: Emily Kidd
Textbook:
Student Study Guide t/a Anatomy & Physiology: SSG
Created: 2010-11-12
Size: 28 flashcards
Views: 16
Textbook:
Student Study Guide t/a Anatomy & Physiology: SSGCreated: 2010-11-12
Size: 28 flashcards
Views: 16
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t/f: total fluid volume in body fluctuates with daily fluid intake
false, total fluid volume remains stable
t/f: the osmolarity of glomerular filtrate is similar to that of the blood
true
the osmolarity of the tubular fluid _______ as if flows down the descending limb of the nephron loop
increases
the osmolarity of the tubular fluid _______ as it flows up the ascending limb of the nephron loop
decreases
the osmolarity of the tubular fluid _______ more as it flows through the DCT and the collecting duct
decreases
gets reabsorbed by osmosis along the descending limb
water
actively reabsorbed from the ascending limb, water does not follow because ascending limb is impermeable to it
sodium, potassium, chloride ions
impermeable to water when the level of ADH is low
principal cells in the collecting ducts
t/f: additional solutes, but no more water, get reabsorbed from the DCT
true
urine can be _____ times more dilute than blood plasma or glomerular filtrate
four
when water intake low or water loss high, kidneys make ____ volumes of ______ concentrated urine because of the effect that ADH has on collecting duct
small, highly
________ of interstitial fluid increases 4x from cortex to medulla, because of presence of Na+1, Cl-1, and urea
osmolarity
_______ portion of collecting duct is more permeable to water than to NaCl
medullary
concentrated urine formed because the nephron loop creates a ___________ multiplier
countercurrent
maintains an osmotic gradient in the interstitial fluid of the renal medulla
countercurrent multiplier
permeable to water, but not permeable to sodium or chloride
descending limb
water leaves descending limb, which _______ concentration of tubular fluid
increases
ascending limb is impermeable to _______, but _________ ions (3) are transported out of the tubular fluid
water, sodium, potassium, chloride
concentration of tubular fluid _________ but __________ of renal medulla stays high
decreases, osmolarity
somewhat permeable to urea
collecting duct
continual recycling between these to increase osmolarity in the renal medulla
collecting ducts and the medulla
develops from the arrangement of the juxtamedullary nephrons and the vasa recta
countercurrent exchange system
as blood flows into the medulla, water diffuses out of the _______ ______ and ________ and ________ ions diffuse into the vasa recta
vasa recta, sodium, chlorids
as blood flows out of the medulla, ______ and ________ diffuse out of the vasa recta and _________ diffuses in
sodium and chloride ions, water
net result of the countercurrent exchange system is what?
reabsorption of water from tubular fluid
volume of blood at the end of the vasa recta is ________ than at the beginning
greater
ADH makes the collecting ducts more permeable to water by inserting _________ into the membranes of the ___________ cells
aquaporins, principal
the osmotic gradient in the renal medulla "pulls" water out of the collecting duct to form ________ _____
concentrated urine
About this deck
By: Emily Kidd
Textbook: Student Study Guide t/a Anatomy & Physiology: SSG
Created: 2010-11-12
Size: 28 flashcards
Views: 16
Textbook:
Student Study Guide t/a Anatomy & Physiology: SSGCreated: 2010-11-12
Size: 28 flashcards
Views: 16
About StudyBlue
STUDYBLUE makes things that make you better at school.
Things like online flashcards with photos and audio.
Things like personalized quizzes and friendly reminders about when (and what) to study next.
Think of it as a digital backpack™: access to all of your study materials online and on your phone.
STUDYBLUE exists to make studying efficient and effective for every student, for free. Join us.
“I have been getting MUCH better grades on all my tests for school. Flash cards, notes, and quizzes are great on here. Thanks!”
Kathy
Kathy