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- Acid dissociation constant
- Acid-base extraction
- Acid-base reaction
- Acid-base physiology
- Acid-base homeostasis
- Dissociation constant
- Acidity function
- Buffer solutions
- pH
- Proton affinity
- Self-ionization of water
- Acids:
- Bases:
Acid-base homeostasis is the part of human homeostasis concerning the proper balance between acids and bases, in other words the pH. The body is very sensitive to its pH level. Outside the range of pH that is compatible with life, proteins are denatured and digested, enzymes lose their ability to function, and the body is unable to sustain itself.
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Mechanism
Gains and losses of acid and base must be balanced. The study of the acid-base reactions in the body is acid base physiology.
Buffering agents
Any substance that can reversibly bind hydrogen ions is called a buffering agent. They function to impede any change in pH. Hydrogen ions are buffered by extracellular (e.g., bicarbonate, ammonia) and intracellular buffering agents (including proteins and phosphate). The buffering ability of plasma acts as an immediate defense against pH imbalance.
Active regulation
A short term method of compensating for acid-base imbalance involves regulating ventilation rate. By changing the ventilation rate, the body can alter the concentration of carbon dioxide in the blood, which alters the pH. In the long term, the kidneys maintain acid-base homeostasis by altering the excretion of excess acid or base.
See also
- Acid-base imbalance
- Acid-base physiology
- Acidosis
- Alkalosis
- Mixed disorder of acid-base balance
- Renal physiology
External links
- On-line text at AnaesthesiaMCQ.com
- Physiology at MCG 7/7ch12/7ch12lin
- Overview at kumc.edu
- Overview at mcgill.ca
Wikipedia content modification information:
- This page was last modified on 29 July 2008, at 20:43.
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