Flashcards in Fluid in the body Deck (18)
What % of body content is water?
How does body fat affect the bodies water content?
Obese person = 40% body is water
Lean person = 80% body is water
What three things manage body water content?
What is body water balance?
The relationship where the body balances the body water content by intaking the same amount as it loses
What are the two types of body water and what percentage are they?
The Intracellular fluid = 2/3 of body water
The Extracellular fluid = 1/3 of body water
How is the ECF divided and what are the breakdowns?
Interstitial fluid (fluid that surround the cells)= 80% of ECF
Plasma (fluid in circulatory system) = 20% of ECF
What are the volumes of these breakdowns?
ICF = 27 Litres
Interstitial Fluid = 11
Plasm = 3-3.5 Litres
What is the barrier between the intracellular fluid and the interstitial fluid?
What is the barrier between the Interstitial fluid and the plasm?
Blood capillary walls
Describe water intake
Water intake occurs via the plasma. It occurs from metabolic reactions (around 200ml a day) and food and drink (around 1.5-2.5 L a day)
Describe water loss
Water loss occurs via the plasma. It occurs from water loss from kidneys (0.5-1.5 L a day).
Lungs (0.3-0.4 L a day)
Skin (0.2-1 L a day)
Faeces (0.1-0.2 L a day)
Describe the ionic makeup of plasm and interstitial fluid?
Similar as small ions can move across capillary walls with fluid.
Proteins are to big so the protein content of Plasma is much higher than interstitial fluid.
What is Colloid Osmotic Pressure?
Because of the higher concentrations of proteins in the plasm, there is a lower concentration of water. This creates a concentration gradient from the interstitial fluid down a concentration gradient into the plasm.
So plasma proteins help to retain water in plasma
Describe how oedema occurs.
-Starvation creates a lack of proteins in plasma
- initiates the breakdown of muscle tissue to replace plasma protein
-loss of plasm proteins removes the concentration gradient so fluid not retained in plasma
-to much water in interstitial spaces = swelling = kwashiorkor
What is CSF?
A specialised part of the ECF, found in the cerebral ventricles, and outer portions of brain and spinal cord
How much CSF is there and what is its composition?
No cells present, lower protein content and slightly different ionic content
What does CSF do?
Supports, protects and supplies nutrients