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a. Why would you expect blood in the tissues to be more acidic than blood in the lungs?

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b. Why would you expect blood in the lungs to be more basic than blood in the tissues?

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c. Carbonic acid (H₂CO₃) is a weak acid (dissociates only slightly). Why does this help to buffer blood if hydrogen ions (H⁺) are added?

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d. Water also dissociates only slightly. What reaction would you expect if hydroxide ions (OH^-) are added to blood? How does this reaction help to buffer blood?

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a. Why is it better to give a person a mixture of oxygen (O₂) and carbon dioxide (CO₂) gases to stimulate breathing?

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b. Why is it impossible for a person to commit suicide by holding his or her breath? (Hint-what gas builds up?)

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c. Why is it workable for the carotid and aortic bodies to be sensitive to the hydrogen ion concentration [H¹] of the blood rather than O₂?

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d. Why would you predict that the respiratory center is sensitive to the presence of carbon dioxide rather than to the absence of oxygen in the blood?

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