Physio: Excretory System

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  1. Plamsa and interstitial fluids are composed of
    Na, Cl, and HCO3
  2. Cytoplasm (cystol) is composed of
    K, Mg, HPO4/H2PO4
  3. Functions of the excretory system
    • 1.remove metabolic wastes and xenobiotics
    • 2.maintain water and electrolyte balance
    • 3.make hormones
    • 4.regulate pH
    • 5.Gluconeogenesis
  4. What does the loop of henle use to facilitate diffusion? What's secreted at which end?
    Counter current exchange

    • ascending: Na
    • descending: H2O
  5. Why is urea reabsorbed from the collecting duct?
    To help maintain the increased medullary osmolarity in the spaces between the loop of henle of the nephron
  6. Name the methods of which water is lost.
    • 1. urine
    • 2. feces
    • 3. insensible loss
    • 4. sweat
  7. Name the methods of which water is gained.
    • 1. liquid intake
    • 2. solid intake
    • 3. metabolism
  8. What is reabsorbed and what is secreted by in the nephron?
    reabsorbed: glucose, urea, Na, water, amino acids.

    secreted: H and K
  9. How much water is reabsorbed from the ultrafiltrate?
  10. Timmy hasn't eaten any Na for the past week, assuming he's still alive, what kind of physiological response is his doing to compensate for this lack of Na?
    His body is producing aldosterone thus stimulating Na active transport pumps and increasing Na absorption from the ultrafiltrate.
  11. Atrial natriuretic hormone is produced from where and does what?
    heart, and inhibits Na reabsorption and thus increases Na and water excretion
  12. What roles do the gut, kidney, and bone play in Ca levels?
    gut: absorbs Ca

    bone: stores Ca

    kidney: excretes Ca
  13. Which cells in the bone play a role in the storing or dissolving of bone for Ca?
    Osteoblast: store Ca into the bone (formation)

    Osteoclast: dissolve bone into Ca and PO4
  14. Which hormones play a role in the [Ca] in the plasma?
    calitonin: inhibits osteoclasts

    PTH: stimulate osteoclast
  15. What is the importance of Vit D3 for bone formation?
    It mineralizes the bone making it hard and strong.
  16. Hypercalcemia, eucalcemia, hypocalcemia, how do you deal with each?
    hyper: increase calitonin levels decrease plasma Ca levels

    eu: no change needed

    hypo: increase PTH levels and increase plasma Ca levels
Card Set:
Physio: Excretory System
2013-04-16 08:21:14
Physio Excretory System

Physio: Excretory System
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