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How can you describe the pathway of oxygen in respiratory system?
From the nose it follows the respiratory track (pharynx, trachea, bronchi) to the lungs where in the alveoli it passively diffuses into the blood enters the red blood cells and gets attached to an iron atom in haemoglobin.
It is then transported to the body where it gets released and passively diffuses into a cell to be used in cellular respiration to accept electrons that originated in fuel molecules.
The Pathway
Air enters the nostrils
passes through the nasopharynx,
the oral pharynx
through the glottis
into the trachea
into the right and left bronchi, which branches and rebranches into
bronchioles, each of which terminates in a cluster of
alveoli
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