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Ch. 25 Fluid, Electrolyte, and Acid-Base Homeostasis
Amerman- Human Anatomy & Physiology 3e
Amerman3rd EditionHuman Anatomy & PhysiologyISBN: 9780138247201, 9780138247928, 9780138201814Not the one you use?Change textbook
All textbooksAmerman 3rd EditionCh. 25 Fluid, Electrolyte, and Acid-Base HomeostasisProblem 16d
Chapter 25, Problem 16d

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
d. Renal compensation for metabolic alkalosis consists of reabsorption of hydrogen ions and secretion of bicarbonate ions.

Verified step by step guidance
1
Step 1: Understand the concept of metabolic alkalosis. Metabolic alkalosis occurs when there is an increase in blood pH due to an excess of bicarbonate ions (HCO₃⁻) or a loss of hydrogen ions (H⁺). The body compensates for this imbalance primarily through respiratory and renal mechanisms.
Step 2: Review the role of renal compensation in metabolic alkalosis. The kidneys help restore pH balance by adjusting the reabsorption and secretion of hydrogen ions (H⁺) and bicarbonate ions (HCO₃⁻).
Step 3: Analyze the statement provided. The statement claims that renal compensation for metabolic alkalosis involves reabsorption of hydrogen ions and secretion of bicarbonate ions. Consider whether this aligns with the physiological response to metabolic alkalosis.
Step 4: Correct the statement if it is false. In metabolic alkalosis, the kidneys typically respond by decreasing the reabsorption of bicarbonate ions (HCO₃⁻) and increasing the excretion of bicarbonate ions into the urine. This helps lower the blood bicarbonate levels and restore pH balance. Additionally, the reabsorption of hydrogen ions (H⁺) is not a primary mechanism in this process.
Step 5: Rewrite the corrected statement if necessary. The corrected statement should read: 'Renal compensation for metabolic alkalosis consists of decreased reabsorption of bicarbonate ions and increased excretion of bicarbonate ions.'

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Metabolic Alkalosis

Metabolic alkalosis is a condition characterized by an increase in blood pH due to an excess of bicarbonate or a loss of hydrogen ions. This can occur from various causes, including prolonged vomiting, diuretic use, or excessive intake of alkaline substances. Understanding this condition is crucial for recognizing how the body attempts to restore acid-base balance.
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Renal Compensation

Renal compensation refers to the kidneys' ability to regulate blood pH by adjusting the excretion or reabsorption of acids and bases. In response to metabolic alkalosis, the kidneys typically decrease bicarbonate reabsorption and increase hydrogen ion secretion to help lower blood pH. This process is essential for maintaining homeostasis in the body's acid-base balance.
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Bicarbonate and Hydrogen Ion Balance

The balance between bicarbonate (HCO3-) and hydrogen ions (H+) is critical for maintaining the body's pH level. Bicarbonate acts as a buffer, neutralizing excess acids, while hydrogen ions contribute to acidity. In metabolic alkalosis, the body must adjust this balance, often leading to decreased bicarbonate reabsorption and increased hydrogen ion secretion by the kidneys to correct the elevated pH.
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Related Practice
Textbook Question

Which of the following statements correctly describe(s) the role of aldosterone?

a. Aldosterone triggers sodium ion and so water reabsorption.

b. Aldosterone triggers potassium ion secretion.

c. Aldosterone triggers hydrogen ion secretion.

d. Both a and b are correct.

e. All of the above are correct.

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Textbook Question

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

c. Respiratory compensation for metabolic acidosis consists of hypoventilation.

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Textbook Question

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

b. Renal compensation for acid-base disturbances begins within minutes, whereas respiratory compensation begins within several hours.

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Textbook Question

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

e. You would expect to find an elevated Pco₂ in arterial blood gas analysis of a patient with respiratory acidosis.

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Textbook Question

How does angiotensin-II help to restore fluid balance when a person is dehydrated?

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Textbook Question

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

a. Respiratory acidosis is caused by hypoventilation.

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