Neuro - Know Your Body The Precious body fluids neurons run...

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Know Your Body The “Precious body fluids” - neurons run on ionic shifts intake, outtake Daily water intake - total daily intake – about 2300 mL Most take in via oral route - about 2/3 as water or beverages - some in food - snal amount through oxidation of hydrogen Daily water loss – 1400 mL via urine 100 mL through feces 350 mL through skin- insensible 350 mL through respiration- insensible insensible – not aware of the loss 100 mL through sweat; can increase to 5,000 mL/day with prolonged, vigorous exercise body composition – 40 L for 70 kg (155 lb) 55 (male)-65% water (female) can be as low as 45% in obese body - infants start at about 75% water and decrease thru about 10 years compartments: in cell and outside of cell -intracelluluar fluid ICF -extracellular fluid ECF ICF – colume about 25 liters – contained in the approxiamate 75 trillion cells of body ECF – about 15 - ICF - interstitial fluid- 10 liters, includes intraocular, cerebrospinal, intragastric….interstices - IVF – intravascular fluid – blood 5 liters, including 3 liters in plasma -diffusion – particles moving from high to low gradient -osmosis – solvent moving across a semi-permeable membrane “salt sucks” -solvent -solute -solution tonicity – concentration hypertonic – concentration is increased hypotonic – concentration is decreased isotonic – concentration is equal .15 M .09% weight by volume “countercurrent” exchange
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Kidney and Thirst “Efficiency” in living systems -energy and homeostasis
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  • Spring '14
  • JeffreyR.Alberts
  • Vasopressin

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