NR 324 CHEM,Chapter 17 Acid Base, Fluid and ElectrolytesACID BASE BALANCES
Maintain a steady balance between acids and bases to achieve homeostasis
Health problems lead to imbalance
Diabetes mellitus
Chronic ob
...
NR 324 CHEM,Chapter 17 Acid Base, Fluid and ElectrolytesACID BASE BALANCES
Maintain a steady balance between acids and bases to achieve homeostasis
Health problems lead to imbalance
Diabetes mellitus
Chronic obstructive pulmonary disease (COPD)
Kidney disease
o The body normally maintains a steady balance between the acids
produced during normal metabolism and the bases that neutralize and
promote the excretion of the acids.
o Because these acids alter the internal environment of the body, their
regulation is necessary to maintain homeostasis and acid-base balance.
o Many health problems may lead to acid-base imbalances. Patients with
diabetes mellitus, COPD, and kidney disease frequently develop acid-base
imbalances.
o It is important to remember that an acid-base imbalance is not a disease
but a manifestation of an underlying health problem. Always consider the
possibility of acid-base imbalance in patients with serious illnesses.
pH
Measure of H+ ion concentration
Blood is slightly alkaline at pH 7.35 to 7.45
<7.35 is acidosis
>7.45 is alkalosis
• The acidity or alkalinity of a solution depends on its hydrogen ion (H+
) concentration.
An increase in H+
concentration leads to acidity; a decrease leads to alkalinity.
• Despite the fact that acids are produced by the body daily, the H+
concentration of
body fluids is small and maintained within a narrow range to ensure optimal cell
function.
• Hydrogen ion concentration is usually expressed as a negative logarithm (symbolized
as pH) rather than in milliequivalents. The use of the negative logarithm means that
the lower the pH, the higher the H+
concentration.
• The pH of a chemical solution may range from 1 to 14. A solution with a pH of 7 is
considered neutral. An acid solution has a pH less than 7, and an alkaline solution has
a pH greater than 7.
• Blood is slightly alkaline (pH 7.35 to 7.45); yet if it drops below 7.35, the person has
acidosis, even though the blood may never become truly acidic. If the blood pH is
greater than 7.45, the person has alkalosis.
Acid Base Regulation
Metabolic processes produce acids that must be neutralized and excreted
Regulatory mechanisms
Buffers
Respiratory system
Renal system
• Because norm
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