Answered

Which of the following describes how concentration gradients regulate the flow of oxygen into the body?

A. A low concentration of oxygen causes oxygen to move into red blood cells.
B. A high concentration of oxygen causes oxygen to move out of the alveoli.
C. A low concentration of oxygen causes oxygen to move out of the lungs.
D. A high concentration of oxygen causes oxygen to move into the trachea.



Answer :

GinnyAnswer

Final answer:

Oxygen moves from high to low concentrations based on pressure gradients, facilitating its movement from the alveoli to the bloodstream and tissues.


Explanation:

Differences in partial pressures of O₂ create a gradient that causes oxygen to move from the alveoli to the capillaries and into tissues. The high concentration of oxygen in the alveoli compared to the lower concentration in the blood of pulmonary capillaries drives oxygen diffusion into the blood, where it binds to hemoglobin and is transported to tissues for cellular respiration.

Oxygen and carbon dioxide move independently, diffusing down their own pressure gradients based on the concentration differences.


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