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Tissue Fluid
Lymph is a tissue that diffuses into the lymphatic capillaries
In the alveoli of the lungs. This is where oxygen diffuses from the lungs into the bloodstream and carbon dioxide diffuses out of the bloodstream and into the lungs.
Red blood cells does not have a direct contact with the body cells.A substance called the tissue fluid does.It leaks out from the blood capillaries carrying oxygen and food substance to the body cells.It then carry waste materials out of the body cells.However, some of this substance does return to the blood while some are collected in the lymph vessel.The tissue fluid in the lymph vessel is called lymph.
Once oxygenated blood reaches the capillaries, the velocity of the blood is very slow - which favours the exchange of oxygen. Oxygen therefore diffuses across the walls of the capillaries into the tissues that need it.
Diapedesis
Capillaries
Internal respiration
chyme
Tissue without capillaries is called avascular tissue. Examples of avascular tissue include:CartilageEpitheliaCorneaLensAll organs contain blood vessels.
Co2
filtration