HLSC2460U Pathophysiology I - Chapter 3
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Questions and Answers

What is the normal range for plasma osmolality?

  • 280 – 294 mOsm/kg (correct)
  • 320 – 350 mOsm/kg
  • 250 – 270 mOsm/kg
  • 300 – 320 mOsm/kg
  • Which type of fluid imbalances is characterized by changes in water accompanied by proportional changes in [NaCl]?

  • Isotonic imbalances (correct)
  • Osmolar imbalances
  • Hypotonic imbalances
  • Hypertonic imbalances
  • What mechanism primarily leads to isotonic fluid imbalances?

  • Proportional alterations in NaCl and water (correct)
  • Changes in acid-base levels
  • Excessive fluid retention only
  • Inconsistent Na+ concentrations
  • What is the primary cause of isotonic fluid loss in conditions like hemorrhage?

    <p>Proportional loss of NaCl and water</p> Signup and view all the answers

    Which of the following is NOT a common example of isotonic excess?

    <p>Dehydration</p> Signup and view all the answers

    What happens to cells in a hypotonic solution?

    <p>Cells swell as water moves into them.</p> Signup and view all the answers

    Which condition is associated with hypernatremia?

    <p>Water deficit causing cell shrinkage.</p> Signup and view all the answers

    Which symptom is commonly associated with hyperkalemia?

    <p>Increased neuromuscular excitability.</p> Signup and view all the answers

    What is the primary cause of metabolic acidosis?

    <p>Accumulation of acids due to renal failure.</p> Signup and view all the answers

    What does alkalosis indicate in the body?

    <p>Decrease in hydrogen ions and increased pH.</p> Signup and view all the answers

    Which of the following symptoms would be expected in a patient with hypocalcemia?

    <p>Muscle cramps and convulsions.</p> Signup and view all the answers

    What is a common cause of respiratory acidosis?

    <p>Airway obstruction preventing proper gas exchange.</p> Signup and view all the answers

    Which ion plays a critical role in determining membrane excitability?

    <p>Calcium.</p> Signup and view all the answers

    Which of the following best describes the role of the carbonic acid-bicarbonate buffering system?

    <p>Removes hydrogen ions from the blood via alveolar ventilation.</p> Signup and view all the answers

    What is a potential complication of prolonged hypercalcemia?

    <p>Formation of kidney stones.</p> Signup and view all the answers

    Study Notes

    Edema

    • Review focused on fluid imbalance and its implications on cellular function.

    Sodium, Chloride, and Water Balance

    • Water imbalances arise from changes in osmotic gradients, influenced primarily by NaCl concentrations.
    • Tonicity refers to effective osmolality, differentiating it from osmolarity.
    • Normal plasma osmolality ranges from 280 to 294 mOsm/kg.

    Water and Solute Imbalances

    • Isotonic: Equal change in water and NaCl; normal extracellular NaCl; no cellular shape change. Common examples include hemorrhage and kidney failure.
    • Hypotonic: Decreased extracellular NaCl leading to cell swelling; linked with hyponatremia and water intoxication.
    • Hypertonic: Elevated extracellular osmolality causing cell shrinkage; associated with hypernatremia and water deficit conditions like hyperglycemia.

    Potassium and Calcium Balance

    • Involves conditions like hypokalemia, hyperkalemia, hypocalcemia, and hypercalcemia, impacting muscle and cardiac function.
    • Changes in potassium levels can lead to muscle weakness, heart dysrhythmias, or seizures.
    • Electrocardiogram (ECG) changes may be observed with potassium serum levels at 5.0 mEq/L, often due to renal failure or hemolysis.

    Hormonal Regulation

    • Calcium imbalance is regulated by parathyroid hormone (PTH).
    • Common causes of hypocalcemia include hyperparathyroidism, bone metastases, nutritional deficiencies, and inadequate absorption.

    Acid-Base Imbalances

    • Occurs when blood acidity or basicity changes beyond normal buffering capacity.
    • Two primary types: acidosis (increased H+ concentration) and alkalosis (decreased H+ concentration).

    Important Terms

    • Acidosis: Increased H+ or base loss results in decreased pH.
    • Alkalosis: Decreased H+ or base excess results in increased pH.
    • Respiratory-related: Imbalances caused by respiratory disorders.
    • Metabolic-related: Imbalances resulting from metabolic (renal) disorders.

    Carbonic Acid-Bicarbonate Buffering System

    • Acts to regulate blood pH by balancing hydrogen ions and carbon dioxide through respiratory and renal systems.

    Common Causes of Acid-Base Imbalances

    • Acidosis: Caused by respiratory center depression or airway obstruction.
    • Alkalosis: Resulting from conditions like alveolar hyperventilation.

    Clinical Manifestations

    • Calcium imbalance may lead to symptoms ranging from asymptomatic to neuromuscular excitability, seizures, or complications like kidney stone formation.

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    Description

    This quiz covers key concepts from Chapter 3 of McCance & Huether's 8th edition textbook focusing on the cellular environment and alterations, including an in-depth look at edema. Gain a deeper understanding of pathophysiological changes and their implications in health science. Prepare to test your knowledge on these essential topics.

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