Yes, capillaries form a network around the alveoli. It is through the alveolar walls and into the capillaries that oxygen enters the blood stream. Carbon dioxide leaves the blood by the reverse route.
They are present in the lung surrounding the alveoli.
Oxygen
A functional unit of lung is called an Alveolus. one functional unit of lung consists of Alveolar sac, pulmonary capillaries and bronchial capillaries.
Pulmonary Capillaries
100 million
A functional unit of lung is called an Alveolus. one functional unit of lung consists of Alveolar sac, pulmonary capillaries and bronchial capillaries.
Because if blood pressure in lung capillaries was as high as it is in body capillaries, the hydrostatic pressure caused by this blood pressure would force blood plasma out of the capillaries into intracellular spaces (as is done in body capillaries) or into the alveoli. This would reduce the efficiency of gas exchange.
diffusion
Unoxygenated blood travels to the heart though the veins to be pumped to your lung capillaries. At you lung capillaries the blood becomes oxygenated and then goes back to the heart to pump oxygenated blood to the rest of your body. the capillaries blood travels though you arteries.
No. The capillaries are part of the circulatory system.
a couple of miles long
the direction of movement of oxygen from the air you breathe and to dispose of excess.