Which of the following substances is responsible for donating H+ ions to act as a buffer when blood pH rises?

Rationale

Carbonic Acid donates H+ ions to act as a buffer when blood pH rises.

Carbonic acid plays a crucial role in maintaining the pH balance in blood by releasing H+ ions when the pH increases, thus helping to neutralize the excess base and restore homeostasis. This buffering action is essential for the proper functioning of biological systems.

A (Carbon Monoxide) YOUR ANSWER

Carbon monoxide is a colorless, odorless gas that primarily binds to hemoglobin in red blood cells, inhibiting oxygen transport. It does not participate in acid-base buffering in blood and has no role in donating H+ ions, making it irrelevant to the question of pH regulation.

B (Oxygen) YOUR ANSWER

Oxygen is vital for cellular respiration and energy production, but it does not donate H+ ions and is not involved in the buffering of blood pH. Its role is primarily as an electron acceptor in metabolic processes, rather than in acid-base balance.

C (Carbon Dioxide) YOUR ANSWER

Carbon dioxide is produced during cellular respiration and can influence blood pH through its conversion to carbonic acid. However, it does not directly donate H+ ions itself; instead, it participates in the formation of carbonic acid, which then dissociates to release H+ ions.

D (Carbonic Acid) CORRECT

Carbonic acid is formed from the reaction of carbon dioxide and water. When blood pH rises, carbonic acid can dissociate to release H+ ions, effectively lowering the pH and countering alkalinity. This property is central to its function as a buffer in the blood.

Conclusion

In summary, carbonic acid is the substance responsible for donating H+ ions to buffer blood pH when it rises, playing a vital role in maintaining acid-base homeostasis. Other substances, such as carbon monoxide, oxygen, and carbon dioxide, do not fulfill this specific buffering function, emphasizing the unique importance of carbonic acid in physiological pH regulation.

Which of the following substances is responsible for donating H+ ions to act as a buffer when blood pH rises?

Carbonic Acid donates H+ ions to act as a buffer when blood pH rises.

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