BIOCHEM C785 Unit 5 Quiz (Real quiz)

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What is happening to the pH of the lungs due to exhalation?

CO2 increases from exhalation, thus the pH of the lungs increases.

CO2 increases from exhalation, thus the pH of the lungs decreases.

CO decreases from exhalation, thus the pH of the lungs

decreases.

CO2 decreases from exhalation, thus the pH of the lungs increases.

Hemoglobin acts as a buffer to prevent blood from becoming too acidic by

binding ___.

Correct! The CO2 in the lung decreases as we exhale and the H+ that

was on hemoglobin is recombined with the bicarbonate ion which

produces CO2 and H2O. The acidic H+ is now part of water, which is

neutral, thus increasing the pH.

excess oxygen

excess CO2

excess H+

excess bicarbonate

What property of hemoglobin, not observed in myoglobin, enables hemoglobin

to be an effective oxygen delivery molecule?

Bent shape

Parabolic curve

Cooperativity

High iron content

Which feature of hemoglobin makes it an effective oxygen transport molecule?

Correct! H+ causes blood pH to drop and become acidic. Hemoglobin

binds to H+ which not only causes O2 to be released to the tissues

but also buffers the blood to allow the pH to increase.

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