capillaries and tissue cells
Capillary exchange is the process by which substances, such as oxygen and nutrients, are exchanged between the blood in capillaries and the surrounding tissues. This occurs through diffusion, facilitated diffusion, and active transport. The exchange is driven by a concentration gradient and the movement of substances across the capillary wall is regulated by small pores called fenestrations and by the presence of transport proteins.
Pure diffusion ... everything flows from high concentration toward low. No energy is expended in these exchanges.
capillaries
Mostly because of a difference in concentration between the intra- and extracellular space. Because of this, diffusion through a membrane occurs.
Diffusion occurs in the human body in a variety of ways. Examples of diffusion are through respiration, ion movement and the diffusion of nutrients in the kidney and small intestine.
Alveoli are site of gas exchange. Actual diffusion of gases occurs at interstitial space between capillaries and alveolar cells.
The gas occurs by simple diffusion through the cells.
There is an exchange with oxygen, nutrients, and carbon dioxide and water vapor.
Capillaries allow Glucose and oxygen to move out of the blood in the capillaries into interstitial fluid and into the cells. Fluid is exchanged between capillary blood and interstitial fluid.
Solid state diffusion (between metals) and gaseous diffusion (a gas in a metal).
No. Osmosis refers to the movement of water only. Gases move by diffusion.
The structure of capillaries help diffusion occur fast enough to keep you alive by the nutrients and gases occurs in these specialized blood vessels which are between arteries and veins.