Sometimes, during stress or trauma, a person can start to...

Sometimes, during stress or trauma, a person can start to hyperventilate. Then the person might breathe into a paper bag to avoid fainting. (10.8)
a. What changes occur in the blood pH during hyperventilation?
b. How does breathing into a paper bag help return blood pH to normal?

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Key Concepts

Rebreathing Technique

Rebreathing, such as breathing into a paper bag, helps correct the imbalance by allowing the individual to inhale a higher concentration of CO2. This increases the CO2 level in the blood, thereby promoting the formation of carbonic acid which lowers the blood pH back to its normal range, counteracting the effects of hyperventilation-induced alkalosis.

Carbon Dioxide and Blood pH Regulation

Carbon dioxide plays a crucial role in maintaining blood pH balance through the formation of carbonic acid when it reacts with water. Changes in CO2 levels directly influence the acid-base equilibrium of the blood; a decrease in CO2 leads to a higher pH (alkalosis), while an increase restores the pH toward normal levels.

Respiratory Alkalosis

This concept refers to a condition in which the blood pH increases due to a decrease in carbon dioxide levels in the blood. When a person hyperventilates, they expel CO2 faster than it's produced, leading to a reduction in carbonic acid concentration and thus raising the blood pH, which can affect various bodily functions.

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