The capillary bed in the lungs is where the oxygen and carbon dioxide are exchanged.
The only muscle that is a functional part of the capillary system are part of the pre-capillary sphincters. It is smooth muscle encircling the arterial end of a capillary and controls the blood flow. Not every cell is getting blood at every second for seconds at a time capillary can be shut of to direct blood to other parts of the tissue that need it.
The only muscle that is a functional part of the capillary system are part of the pre-capillary sphincters. It is smooth muscle encircling the arterial end of a capillary and controls the blood flow. Not every cell is getting blood at every second for seconds at a time capillary can be shut of to direct blood to other parts of the tissue that need it.
Osmotic pressure...
Water and dissolved substances leave the arteriole end of the capillary due to hydrostatic pressure being higher than osmotic pressure and enter the venule of the capillary due to osmotic pressure being higher than hydrostatic pressure.
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Molecules traveling within the bloodstream pass through the capillary cell wall via osmotic pressure and diffuse through the interstitial fluid before encountering the tissue cell wall.
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Diapedesis
cell membrane
The selective permeability, also called semi-permeability, of the membrane controls which substances cant enter and exit the cell.
Diapedesis