Gaseous Exchange in Human

Biology

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Gaseous Exchange in Human

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The partial pressure of oxygen in the alveolus and blood capillaries around the alveolus

In alveolus; high, capillaries around the alveolus; low; causing the oxygen to diffuse from the alveolus into the blood capillaries

The partial pressure of carbon dioxide in the alveolus and the blood capillaries around the alveolus

Alveolus; low, blood capillaries of alveolus; high; causing the carbon dioxide to diffuse from the blood capillaries into the alveolus

Ways to transport oxygen from the lungs to body cells

98% of oxygen combines with hemoglobin to form oxyhemoglobin. 2% oxygen is transported as a dissolved gas in the blood plasma

Transport of oxygen from lungs to body tissues

Oxygen diffuses from the alveoli into blood capillaries and combine with hemoglobin to form oxyhemoglobin. Until it reaches the body cells, oxyhemoglobin dissociates and oxygen enters the body cells

Gaseous exchange between blood and body tissues

Blood (partial pressure of oxygen is high), body cells (partial pressure of carbon dioxide is high), causing the oxygen to diffuse into body cells, carbon dioxide diffuses into blood capillaries

Ways to transport carbon dioxide from body tissues to the lungs

70% of carbon dioxide is carried in the form of bicarbonate ions, 23% of carbon dioxide forms carbaminohemoglobin, and 7% is carried in the form of carbonic acid

The transport of carbon dioxide from body cells to tissue capillaries

Bicarbonic acid is formed in blood cells. Bicarbonic acid is broken down into bicarbonate ions and hydrogen ions. Bicarbonate ions are transported to the lungs

The transport of carbon dioxide from lung capillaries to alveolus

Bicarbonate ions recombine with hydrogen ions to form carbonic acid. Carbonic acid is broken down into water and carbon dioxide. Carbon dioxide is eliminated during exhalation

Gas diffusion (1)

Depends on the partial pressure difference between two areas

Gas diffusion (2)

The gas diffuses from an area where its partial pressure is higher to an area where its partial pressure is lower, which is down a partial pressure gradient

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