how is oxygen transported in large multicellular organisms like humans
Answers
Answer:
Explanation:
oxygen travels from our nose through the nasal cavity to the trachea then to the bronchi and bronchiole at the end of each bronchioles are small grape like structures called alveoli.
there are capillaries on this alveoli which carry blood
From alveoli the oxygen gets diffused to the RBC cells in the blood capillaries and from here the RBC cells transport to the whole body by the process of diffusion
this is how oxygen is transported
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Transport of oxygen occurs in humans as follows
Inhaling the oxygen rich air through nose. On reaching alveoli, passing through trachea and bronchioles, it is exchanged with carbon dioxide. Capillaries are present near alveoli carrying RBC filled with carbon dioxide.
The exchange occurs due to difference in partial pressure of gases. This oxygenated blood from lungs goes to heart. The oxygenated blood is pumped from aorta to different body parts. Here again change in partial pressure drives exchange of both the gases.
RBCs contain haemoglobin protein that can carry four molecules of oxygen and carbon dioxide at a time, for tissues and exhalation respectively.