Part of an important chemical buffer system in plasma is:
a. Ammonium ions
b. Bicarbonate
c. Calcium
d. Chloride
e. Hydrogen ions
f. Magnesium
g. Phosphate
h. Potassium
i. Sodium
j. Water

Verified step by step guidance

1. Understand that a chemical buffer system in plasma helps maintain the pH balance by neutralizing excess acids or bases.
2. Recall that the most important and abundant buffer system in blood plasma is the bicarbonate buffer system.
3. Recognize that the bicarbonate buffer system involves the equilibrium between carbonic acid (H2CO3) and bicarbonate ions (HCO3\^-), which helps regulate blood pH.
4. Identify that among the options given, bicarbonate (option b) is the key component of this buffer system.
5. Note that other ions like ammonium, phosphate, and proteins can act as buffers in the body, but bicarbonate is the primary plasma buffer.

Key Concepts

Chemical Buffer Systems in Plasma

Buffer systems in plasma help maintain the pH balance by neutralizing excess acids or bases. They consist of weak acids and their conjugate bases, which resist changes in hydrogen ion concentration, thus stabilizing blood pH around 7.4.

Bicarbonate Buffer System

The bicarbonate buffer system is the primary chemical buffer in plasma, involving carbonic acid (H2CO3) and bicarbonate ions (HCO3-). It regulates pH by reversible reactions that convert strong acids or bases into weaker ones, crucial for acid-base homeostasis.

Role of Hydrogen Ions in Buffering

Hydrogen ions (H+) influence the acidity of plasma and interact with buffer systems. Buffers work by binding or releasing H+ to minimize pH changes, making the control of hydrogen ion concentration essential for maintaining physiological stability.