NUTR 200 Lecture Notes - Lecture 29: Fluid Balance, Fluid Compartments, Extracellular Fluid
14 Jun 2020
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NUTR 200
Lecture 29
Water and Fluid Balance I
Water and Electrolytes
• Fluid balance and electrolyte balance and many metabolic reactions
• 60-70% body
• Lean muscle tissue contains 73% water
• Fat contains 20% water
• Males tend to have more body water; ultimately depends on body composition
Fluid Compartments
• Intracellular fluid is inside cells (67%)
• Extracellular fluid is blood fluid and interstitial fluid (33%)
Osmosis
• Water moves based on osmosis
• Based on concentration of solutes on either side of membrane
• Equalize concentration gradient
• High concentration of water to low
Function of Body Fluids
• Solvent
o Dissolves substances for transport
o Dissolved substance is a solute
o Blood transports solutes in the body
• Body temp regulation
o Absorbs excess heat
• Blood moves heat away from the core
o Cools body
• Body secretes fluids via perspiration
• Evaporation of water from skin cools the skin and blood
• Protects and lubricates tissues
o Cerebrospinal, amniotic, synovial (joints), saliva
Recommended Intake
• Total water intake (food, beverages, water)
o Men: 3.7 Liters
o Women: 2.7 Liters
• Fluid intake (beverages and water)
Document Summary
Water and electrolytes: fluid balance and electrolyte balance and many metabolic reactions, 60-70% body, lean muscle tissue contains 73% water, fat contains 20% water, males tend to have more body water; ultimately depends on body composition. Intracellular fluid is inside cells (67%: extracellular fluid is blood fluid and interstitial fluid (33%) Osmosis: water moves based on osmosis, based on concentration of solutes on either side of membrane, equalize concentration gradient, high concentration of water to low. Recommended intake: total water intake (food, beverages, water, men: 3. 7 liters, women: 2. 7 liters, fluid intake (beverages and water, men: 3 liters, women: 2. 2 liters, 1 milliliter per calorie. Inputs: beverages, food, byproduct metabolism, outputs, lungs, skin (sweat, feces, urine. Fluid balance regulated by many organs: brain, detects high concentration of sodium/lower blood volume (pressure, stimulates thirst, secretes antidiuretic hormone, tells kidneys to retain fluid, kidneys, detect low bp.
