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Unit 3

QuestionAnswer
A common age-related change in kidneys is that they: Become slower at removing nitrogenous wastes and toxins
About what percentage of kidney stones pass on their own (as stated)? About 60%
Active Na+ transport in renal tubules is important because it: Provides the gradient that drives reabsorption of many nutrients and water
Active transport in the renal tubules: Moves substances against gradients and requires ATP
ADH increases: Water reabsorption
Adult kidneys are typically about ____ long. 12 cm
After the renal pelvis, urine flows into the: Ureter
Age-related decreases in vitamin D activation can contribute to: Reduced calcium absorption
Aldosterone primarily stimulates: Na+ reabsorption (and K+ secretion) in distal tubule/collecting duct
Angiotensin II can stimulate which responses? Increased aldosterone secretion Increased thirst Vasoconstriction Increased ADH secretion
ANP/BNP primarily increase excretion of: Sodium and water
Approximately what percentage of Na+ and water are reabsorbed before urine is excreted? 97% to 99%
Arcuate (arciform) arteries: Branch from interlobar arteries and arch around renal pyramids
As the bladder, ureters, and urethra lose elasticity with age, bladder capacity often: Decreases
Autoregulation helps keep GFR: Relatively constant
Average adult glomerular filtration rate (GFR) is approximately: 125 mL/min
Beeturia refers to: Pink urine after eating beets (a benign genetic variation)
Blood exits the glomerulus via the: Efferent arteriole
Blood plasma is filtered about ____ times per day. 60
By about age 75, GFR may decrease to about: Half of young adult values
By about age 80, the kidneys may have lost approximately: One-third of their mass
Cardiac natriuretic peptides (ANP/BNP) are released in response to: Increased blood volume and pressure
Created by: Saqdou6618
 

 



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