100 million
Oxygen
A functional unit of lung is called an Alveolus. one functional unit of lung consists of Alveolar sac, pulmonary capillaries and bronchial capillaries.
They are present in the lung surrounding the alveoli.
Pulmonary Capillaries
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.
a couple of miles long
the direction of movement of oxygen from the air you breathe and to dispose of excess.
Oxygen is 'transported' from the lung capillaries to the body capillaries - in an inverse fashion carbon dioxide is transported from the body capillaries to the Lung Alveoli - the Answer is 'It is rich in CO2."
capillaries