Karteikarten
Renal Reabsorption and Secretion
Karten in diesem Stapel (26)
- 1What is renal reabsorption?transport of water and dissolved substances out of the tubular lumen and into the peritubular capillaries
- 2What is the major driving force for reabsorption?low intracellular Na+ and carrier molecules in the apical membrane
- 3Where does most reabsorption in the kidney take place?proximal tubules
- 4What are some of the adaptations of the proximal tubule?convoluted, brush border on apical surface, infoldings of basal membrane, mitochondria, carriers for processes
- 5What % of energy metabolism in the kidneys is associated with Na+ reabsorption?80%
- 6What is antiport transport?counter transport
- 7What is most Na+ reabsorbed in exchange for?H+
- 8Is glucose reabsorption mainly primary or secondary active transport?secondary, dependent on the Na+ gradient
- 9Approx what % of glucose is reabsorbed?nearly 100%
- 10What is meant by the term glucosurea?excess glucose being excreted in urine when the transport maximum is reached
- 11When is glucosurea more likely to occur?diabetes, pregnancy
- 12What effect does a loss of glucose have on water levels?increases water loss and the urine osmolarity increases and reabsorptive abilities of the kidneys decrease
- 13In renal handling, should excretion levels or filtration levels of a substance be higher?amount filtered
- 14Why does splay occur on graphs of renal handling? (deviations between amount filtered and reabsorbed)nephrons have different Tmax for glucose dependign on length of proximal tubule and differences in reabsorptive capabilities
- 15As water is reabsorbed, what other ion increases?Cl-
- 16Approx what % of urea is reabsorbed?50%
- 17How are most metabolic substrates reabsorbed?co-transport with Sodium ions
- 18How are amino acids reabsorbed?co-transport with Sodium ions
- 19How are peptides reabsorbed?removed from tubule via endocytosis
- 20What amount of filtered water is usually reabsorbed?2/3
- 21What is secretion?opportunity to increase urinary excretion of specific substances
- 22Is secretion a passive or active process?active and requires and carrier
- 23What kind of organic molecules is secretion important in eliminating?protein-bound organic molecules
- 24Under what circumstance can organic non-ionized molecules be excreted by secretion?following modification by the liver
- 25What transport mechanism is K+ secretion linked to?Na+/K+ pump in basolateral membrane
- 26What effect does Aldosterone have on K+ secretion?increases it by increasing the number of K+ channels in the distal part of nephrons
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- Beschreibung
- Animal Disease 1 Veterinary Medicine Karteikarten am Renal Reabsorption and Secretion, erstellt von Louise Mason am 02/05/2017.
- Erstellt von
- Louise Mason
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