Compared with blood in the pulmonary veins, blood in the pulmonary arteries has higher concentrations of:O2H+CO2A.I and II onlyB.I and III onlyC.II and III onlyD.I, II, and IIISubmit
Question
Compared with blood in the pulmonary veins, blood in the pulmonary arteries has higher concentrations of:O2H+CO2A.I and II onlyB.I and III onlyC.II and III onlyD.I, II, and IIISubmit
Solution
The pulmonary arteries carry deoxygenated blood from the heart to the lungs, while the pulmonary veins carry oxygenated blood from the lungs back to the heart.
Therefore, compared to blood in the pulmonary veins, blood in the pulmonary arteries has:
- Lower concentrations of O2, because oxygen is picked up by the blood in the lungs and carried back to the heart by the pulmonary veins.
- Higher concentrations of H+, because deoxygenated blood is more acidic.
- Higher concentrations of CO2, because carbon dioxide is carried to the lungs by the pulmonary arteries to be exhaled.
So, the correct answer is C. II and III only.
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