tissue fluid formation Flashcards
what happens in ultra filtration
blood enters the arteriole end of capillaries at high hydrostatic pressure and is forced out through the gaps between endothelial cells.blood and large proteins remain in the capillaries
what remains in the capillaries in ultrafiltration
blood cells and large proteins
what happens in exchange of substances
small dissolved substances (e.g. oxygen and glucose) move with the water and so they can easily move into body cells
what happens in reabsorption
as water leaves the pressure is reduced so water pressure at the venular end of the capillary it is equal to the tissue fluid pressure but since water has been lost from the capillary there is a reduction in water potential in the blood plasma.some water re-enters the capillary by osmosis,and co2 which is dissolved in the water
what happens in the lymphatic system
excess water is drained into the lymphatic system and re-enters the blood at the superior vena cava
What is tissue fluid
The fluid that surrounds all cells in the body
What does tissue fluid have virtually the same composition as
Blood plasma
What does tissue fluid contain
Dissolved ions
Dissolved monomers
Dissolved gases
Some hormones
Some white blood cells
What are some examples of dissolved ions in tissue fluid
Sodium,potassium,chlorine
What are some examples of dissolved monomers in tissue fluid
Amino acids,glucose
What are some examples of dissolved gases in tissue fluid
Oxygen and carbon dioxide
Capillaries have small gaps in them, what does this result in
Liquid and small molecules can be forced out
As blood enters the capillaries from the arterioles what happens
The smaller diameter results in a high hydrostatic pressure so water,glucose,amino acids,fatty acids,ions and oxygens are forced out
What is it that is forced out the capillaries
Water molecules
Dissolved minerals and salts
Glucose
Small proteins and amino acids
Fatty acids
Oxygen
What remains in the capillaries after ultrafiltration
Red blood cells
Platelets
Large proteins
