In an individual with metabolic acidosis, a clue that the respiratory system is compensating is provided by:
a. High blood bicarbonate levels
b. Low blood bicarbonate levels
c. Rapid, deep breathing
d. Slow, shallow breathing

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Step 1: Understand the condition of metabolic acidosis, which is characterized by a decrease in blood pH due to an accumulation of acid or loss of bicarbonate (HCO\_3\^-). This leads to low blood bicarbonate levels.

Step 2: Recognize that the respiratory system compensates for metabolic acidosis by trying to reduce the level of carbon dioxide (CO\_2) in the blood, since CO\_2 reacts with water to form carbonic acid, which affects pH.

Step 3: Recall that to lower CO\_2 levels, the respiratory system increases ventilation, which means breathing faster and deeper to expel more CO\_2 from the lungs.

Step 4: Identify that rapid, deep breathing is called Kussmaul respiration and is a classic respiratory compensation for metabolic acidosis.

Step 5: Conclude that the clue indicating respiratory compensation in metabolic acidosis is therefore rapid, deep breathing, corresponding to option c.

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Metabolic Acidosis

Metabolic acidosis is a condition where there is an excess of acid or a loss of bicarbonate in the body, leading to a decrease in blood pH. It results from causes like kidney failure, diabetic ketoacidosis, or severe diarrhea. Understanding this helps identify why the body needs to compensate to restore acid-base balance.

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Respiratory Compensation

Respiratory compensation occurs when the lungs adjust breathing to help correct blood pH imbalances. In metabolic acidosis, the respiratory system increases ventilation to expel more CO2, reducing acidity. This is typically seen as rapid, deep breathing, known as Kussmaul respiration.

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Blood Bicarbonate Levels

Bicarbonate (HCO3-) acts as a buffer to neutralize acids in the blood. In metabolic acidosis, bicarbonate levels are usually low due to buffering excess acid. Monitoring bicarbonate levels helps differentiate between metabolic and respiratory causes of acid-base disturbances.

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