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

Rationale

Carbonic Acid is responsible for donating H+ ions to act as a buffer when blood pH rises.

In the human body, the carbonic acid-bicarbonate buffer system plays a vital role in maintaining the pH balance of blood. When the pH rises, carbonic acid dissociates into bicarbonate and H+ ions, thereby increasing the concentration of H+ ions and lowering the pH back to normal.

A (Carbon Monoxide) YOUR ANSWER

Carbon Monoxide (CO) does not have the ability to donate H+ ions. Instead, CO binds with hemoglobin in the blood, preventing oxygen from binding to hemoglobin and resulting in oxygen deprivation to tissues.

B (Oxygen) YOUR ANSWER

Oxygen (O2) is essential for cellular respiration, but it does not donate H+ ions. When oxygen levels are too high, it can actually cause oxidative stress and damage to cells.

C (Carbon Dioxide) YOUR ANSWER

Carbon Dioxide (CO2) reacts with water to form carbonic acid, which can then donate H+ ions. However, CO2 itself does not directly donate H+ ions.

D (Carbonic Acid) CORRECT

Carbonic Acid (H2CO3) donates H+ ions when blood pH rises. It does this by dissolving into bicarbonate (HCO3-) and a hydrogen ion (H+). The increase in hydrogen ions lowers the pH, bringing it back to normal.

Conclusion

Among the given options, only Carbonic Acid can donate H+ ions to act as a buffer when blood pH rises. The other substances, Carbon Monoxide, Oxygen, and Carbon Dioxide, do not have this ability. The carbonic acid-bicarbonate buffer system is critical in maintaining the pH balance of blood in the human body.

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

Carbonic Acid is responsible for donating H+ ions to act as a buffer when blood pH rises.

Related Questions

Related Quizzes

How familiar were you with this question?

Report an Issue

Rate this Practice Test