Tissue Fluid Flashcards
What is tissue fluid and what does it do
It is formed by blood plasma (carrying dissolved substances) leaking from capillaries
Surrounds the cells in the tissue and provides them with oxygen and nutrients
What is hydrostatic pressure
Liquid pressure in the capillaries
Created by the ventricles in the heart and maintained by the structure of the arteries
What happens at the arteriole end
The hydrostatic pressure inside the capillary is greater then in the tissue fluid and the osmotic pressure.
The difference in hydrostatic pressure forces fluid containing glucose water oxygen etc out of the blood through gaps in the capillary wall
What remains in the capillary
Red blood cells
Platlets
Plasma protein
As they are too large to be pushed out
What occurs between the tissue fluid and cells
Exchange via diffusion facilitated diffusion and active transport
Oxygen and nutrients enter cell and carbon dioxide band other waste like urea leave the cell and enter the tissue fluid
What happens to the pressure as fluid leaves the capillaries at the arteriole end
Hydrostatic pressure reduces therefore blood pressure at the venous end of the capillaries is much lower
What occurs in the capillary and how does this affect pressure
As water leaves the capillary but the plasma proteins stay the water potential of the blood is lowered therefore the WP in the capillary is lower than in the tissue fluid at the venule end so water moves via osmosis into the capillary carrying co2 and other waste substances
What happens to excess fluid that isn’t re absorbed
Collected into the lymphatic system which returns it to the circulatory system
The pressure falls from the arteriole end of the capillary to the venule end explain why
Loss of water
How does high blood pressure lead to an accumulation of tissue fluid
High blood pressure = high hydrostatic pressure
Increases outward pressure from the arterial end of the capillary
So more tissue is formed
