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(B) The blood maintains a relatively constant $pH$ (approximately $7.4$) despite the transport of large amounts of $CO_2$. This is primarily due to th

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Blood buffers play a major role in $CO_2$ transport.

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(B) The blood maintains a relatively constant $pH$ (approximately $7.4$) despite the transport of large amounts of $CO_2$. This is primarily due to the presence of blood buffers. The bicarbonate buffer system,involving plasma proteins and hemoglobin,acts to neutralize the hydrogen ions $(H^+)$ produced when $CO_2$ reacts with water to form carbonic acid $(H_2CO_3)$. Hemoglobin,in particular,acts as a very effective buffer by binding to $H^+$ ions,thereby preventing the blood from becoming acidic.

Although a large amount of $CO_2$ is transported in the blood,the blood does not become acidic because:

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