The Concentration of Oxygen Is Decreased at High Altitude

question 75

Multiple Choice

The concentration of oxygen is decreased at high altitude.Why would this make it harder for a person to get enough oxygen into their blood?

• A) Hemoglobin cannot bind oxygen well at low concentrations.
• B) The concentration gradient from the alveoli to the blood decreases.
• C) People are working harder at high altitude and have higher demands for oxygen.
• D) The concentration of oxygen in the blood is too low for diffusion into tissues.
• E) The heart cannot obtain enough energy to pump oxygen into the blood from the alveoli.

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