Approximately one billion oxygen molecules. that is because there are about 250 million molecules of haemoglobin in each cell, and each haemoglobin molecule binds to 4 oxygen molecules
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Answer:
pharynx, larynx, trachea, bronchi
Explanation:
During the inhalation through the nose or mouth the air first enters the "pharynx" which is also called as throat,
then the air moves towards the "larynx" . Is a passage between the pharynx and the trachea
Through larynx the air then moves toward the "trachea". It is passage connecting the larynx and the bronchi
and then the air inhaled reaches to the "bronchi" of lungs.
hence, the correct order is "pharynx, larynx, trachea, bronchi"
Molecules that cannot cross the membrane bind to receptors in the membrane. When the signal binds to a receptor changes it's shape. Other Molecules inside the cell respond to the chainging shape of the receptor.
