Question

Select the correct statement about oxygen transport in blood: A. During conditions of acidosis, hemoglobin is able to carry oxygen more efficiently. B. During normal activity, a molecule of hemoglobin returning to the lungs carries one molecule of O2. C. A 50% oxygen saturation level of blood returning to the lungs might indicate an activity level higher than normal. D. Increased BPG levels in the red blood cells enhance oxygen-carrying capacity.

Answer 1

C. A 50% oxygen saturation level of blood returning to the lungs might indicate an activity level higher than normal.

Answer 2

A 50% oxygen saturation level of blood returning to the lungs might indicate an activity level higher than normal.

• Oxygenated blood returns to the heart and is distributed throughout the body by way of the systemic vasculature.

Why oxygen is important for humans?

• Oxygen helps organisms grow, reproduce, and turn food into energy.
• Humans get the oxygen they need by breathing through their nose and mouth into their lungs.
• Oxygen gives cells the ability to break down food in order to get the energy  needed  to survive

Hence, C option is correct.

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