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6 Written questions

6 Multiple choice questions

  1. NaCl electrical gradient
    glucose - co-transported by sodium glucose transport proteins, diffusion
    nitrogenous wastes - diffusion
    other electrolytes - solvent drag
    water - aqua porins
  2. Renal corpuscle:
    -the glomerulus produces filtrate
    -proximal convoluted tubule
    -Descending limb of the nephron loop active transport of salts
    -ascending limb of nephron loop
    -Distal convoluted tubule
    -collecting duct receives filtrate from many DCTs
    -papillary duct merges collecting duct together
  3. the counter current multiplier. This recaptures NaCl and returns it to renal medulla
  4. Glomerular filtration rate is controlled by adjustors glomerular blood pressure:
    autoregulation - mycogenic mechanism (keeps flow constant)
    macula densa on DCT monitors flow (increase of arterioles bp causes vasoconstriction of afferent arteriole)
    signals juxtamedullary cells to constrict (decrease of arteriole bp causes vasoconstriction of arteriole)
    -sympathetic control
    strenuous exercise or acute condition cause afferent arterioles to constrict, lower GFR and urine production, redirecting blood flow to visceral areas.
    -hormonal mechanisms
    rennin release entering chain of angiotensinogenII to vasoconstrictor vessels elevating blood pressure.
    promotes water and NA reabsorption.
    Stimulates sensation of thirst.
  5. 1-glomerular filtration - driven by filtration pressure
    2-Tubular reabsorption and secretion - movetment of solutes and water in and out for the tubules
    3-water conservation regulation of the volume concentration of urine
  6. overview, six organs
    kidneys, ureters, urinary bladder, and urethra

5 True/False questions

  1. trace the flow of blood through the kidneyyellow due to urochrome, smells as bacteria degrade urea to ammonia, density range 1.001-1.028 mmhg, ranges osmolarity 50mOsm/L to 1,200mOsm/L. pH range 4.5-8.5, usually 6.0 with the 95% water, 5% solutes urea, NaCl, KCl, creatinine, uric acid.

          

  2. Describe who the nephron regulates water excretionthe generation of a salinity gradient allows the collecting duct to concentrate urine, also helped by electrolyte reabsorption

          

  3. Explaint eh forces that promote and oppose glomerular filtrationFiltration pressure:
    Glomerular filtration is governed by the same pressures that determine filtration in the other blood capillaries.
    -golmerular hydrostatic pressure (blood pressure) ~60mmhg
    -glomerular osmotic pressure (~32mmhg) opposing filtration
    -capular hydrostatic pressure (~18mmhg) exerted by fluids in capsule
    -capsule colloidal osmotic pressure ~0mmhg

          

  4. Name the major nitrogenous wastes and identify their sourcesprotein catabolism amino acids and NH2 which removed by the liver as uea, there is also uric acid and creatinin.
    Uric acid derives form nucleic acid catabolism.
    Creatininie derives from creatine phosphate catabolism

          

  5. Describe the composition and properties of urinethe generation of a salinity gradient allows the collecting duct to concentrate urine, also helped by electrolyte reabsorption