Fluid Distributions in the Body Flashcards
What proportion of a healthy young woman and man is water?
How does this change with age?
Man 60%
Woman 50%
Decinlines with age
Why do women have a proportional water content less than men?
Women have a higher body fat and lower skeletal muscle
Muscle has a higher water content than fat
What are the different percentages of fluid within the body?
Total = 60% of body weight
ICF 40%
ECF 20%
Why do electrolytes have a greater osmotic power than non electrolytes?
Each electrolyte dissociates into at least two ions
In terms of osmolarity, in what direction does water move?
From least osmolarity to greatest osmolarity
Why pressures regulate the movement of fluid between body compartments?
Hydrostatic and osmotic pressures
What gradient moves water between compartments?
Osmotic
Why is there an unequal distribution of solutes?
Due to:
Size
Charge
Dependance of active transport
What does fluid which moves between plasma and the interstitial fluid pass across?
Capillary membrane
What pressures regulate the movement of fluid between the plasma and interstitial fluid?
Hydrostatic pressures
Osmotic pressures
What is insensible water loss?
When water vaporises out of the lungs in expired air or diffuses directly through the skin
What is the fundamental basis behind why dehydration occurs?
water output exceeds input
How can hypotonic hydration be reversed quickly?
IV hypertonic mannitol
What are the consequences of hypotonic hydration?
Damage to neutrons
