Question

multiple choice 10 points bicarbonate ions in the blood can absorb hydrogen ions, keeping the ph balanced. bicarbonate acts as a ______ in blood.
options: acid, base, alkaline, buffer

Explanation:

To solve this, we analyze each option:

• An acid donates \(H^+\) ions, but bicarbonate absorbs \(H^+\), so not acid.
• A base accepts \(H^+\), but the key here is maintaining pH balance (resisting pH change), which is the role of a buffer. "Alkaline" describes a basic substance, not the role.
• A buffer is a substance that resists pH change by absorbing or releasing \(H^+\) (or \(OH^-\)). Bicarbonate in blood absorbs \(H^+\) to keep pH balanced, so it acts as a buffer.

Answer:

D. buffer