FNH 350 Study Guide - Calcium Metabolism, Distal Convoluted Tubule, Glycogen Synthase

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grayhedgehog174

30 Jun 2014

School

UBC

Department

Food, Nutrition and Health

Course

FNH 350

Professor

All

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Document Summary

Therefore water leaves the loop of henle into the medulla and the urine because more concentrated at the bottom. It is hypertonic now: the ascending loop of henle is impermeable to water (very rare in cells) but permeable to na+ and cl-. Water can"t leave the tubule and there"s already less to begin with but solutes are forced out so that the medulla stays concentrated. Because of this by the time the urine reaches the distal tubule it is hypotonic again: what 3 characteristics of molecules passing through allow the glomerulus to act as a molecular sieve?use albumin as an example, size. The glomerular basement membrane is negatively charged which means that negative proteins such as albumin are repelled: shape. 5. produces renin in the afferent arteriole which affects water retention/homeostasis: what are the 4 characteristics that are needed in a substance used to measure. Compare creatinine to inulin using these characteristics: must be freely filtered b.

Related Questions

13) Regulation of the volume and osmolarity of body fluidsoccurs first in the

a) proximal convoluted tubules.

b) distal convoluted tubules.

c) loop of Henle.

d) glomerular capsule.

e) collecting ducts.

14) Which is NOT True about podocytes?

a) their pedicels form filtration slits

b) they make up the parietal layer of the glomerular capsule

c) they are modified simple squamous epithelial cells

d)all of these choices statements about podocytes are true

15) In the process of forming concentrated urine, symporters inthe loop of Henle cause sodium ions and chloride ions to build upin the renal medulla helping to form the osmotic gradient. ADHincreases reabsorption of water by principal cells in thecollecting ducts.

True or False?

periwinklemoose578

I know that the ascending loop of Henle is impermeable to waterand ions, and, by end of the ascending limb, the osmolarity of thetubular fluid is very low due to the active transport of ions out(e.g, sodium, potassium, chloride).

However, what if the person had to produce hypertonic urine dueto dehydration or some other circumstance? Would the increase inosmolarity be done through a decrease in removal of ions in thedescending limb, or has the distal tubule and collecting ducts gotsomething to do with it?

1. Which of the following vessels, if stimulated to vasoconstrict, would cause increased filtration in the glomerular capillaries?

(a) Afferent arterioleâ(c) Efferent arteriole

(b) Vasa rectaâ(d) Peritubular capillaries

2. Which of the following CORRECTLY describes the flow of filtrate through the renal tubule?

(a) Glomerulus Ã Distal convoluted tubule Ã Ascending limb of nephron loop Ã Descending limb of nephron loop Ã Proximal convoluted tubule Ã Collecting duct

(b) Glomerulus Ã Proximal convoluted tubule Ã Descending limb of nephron loop Ã Ascending limb of nephron loop Ã Distal convoluted tubule Ã Collecting duct

(c) Glomerulus Ã Proximal convoluted tubule Ã Ascending limb of nephron loop Ã Descending limb of nephron loop Ã Distal convoluted tubule Ã Collecting duct

(d) Glomerulus Ã Distal convoluted tubule Ã Descending limb of nephron loop Ã Ascending limb of nephron loop Ã Proximal convoluted tubule Ã Collecting duct

3. Tubular ______________ occurs when certain substances (i.e. ions, drugs) are removed from the bloodstream and placed back into the renal tubule.

(a) Eliminationâ(c) Secretion

(b) Reabsorptionâ(d) Filtration

4. Which of the following is TRUE about the reabsorption process in the proximal convoluted tubule?