Indicate the substance formed in the capillaries of the lungs during gas exchange.

Pulmonary capillaries entwine the alveoli in tangles. Oxygen-rich atmospheric air enters the alveoli with each inhalation. The walls of the capillaries allow alveolar oxygen to chemically react with hemoglobin, which is found in red blood cells. As a result of this reaction, oxyhemoglobin is formed – a source of oxygen for all body tissues.



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