NR-283 PATHOPHYSIOLOGY FLUID, ELECTROLYTE,
AND ACID–BASE IMBALANCES EXAM 300 ACTUAL
QUESTIONS AND CORRECT ANSWERS WITH
RATIONALE LATEST UPDATE ALREADY GRADED A+
ASSURED PASS
This 300-question examination resource provides a comprehensive review of fluid,
electrolyte, and acid-base pathophysiology for nursing students. Organized into six
sections, it covers body fluid compartments, osmotic forces, hormonal regulation,
fluid volume disorders, electrolyte imbalances (sodium, potassium, calcium,
magnesium, phosphate), and acid-base disturbances with ABG interpretation. Each
question includes multiple-choice options, correct answers, and detailed rationales
explaining physiological mechanisms, clinical manifestations, diagnostic findings,
and nursing interventions. The progressive difficulty and clinical scenarios
promote critical thinking and application of pathophysiological concepts. This
evidence-based study tool supports exam preparation and clinical reasoning
development for NR-283 and similar pathophysiology courses.
Section 1: Body Fluid Compartments and Composition (Questions 1-50)
Question 1
Total body water accounts for approximately what percentage of body weight in a
healthy adult?
A) 40%
B) 50%
C) 60%
D) 70%
Answer: C
,Rationale: Total body water accounts for approximately 60% of body weight in a
healthy adult. This percentage varies with age, gender, and body fat composition.
Infants have a higher percentage of body water (about 75%), while elderly
individuals and those with more adipose tissue have a lower percentage. The
remaining 40% of body weight consists of solids such as bone, muscle, and fat.
---
Question 2
The extracellular fluid compartment includes which of the following subdivisions?
A) Intravascular, interstitial, and transcellular
B) Intravascular and intracellular
C) Interstitial and intracellular
D) Plasma and cytosol
Answer: A
Rationale: The extracellular fluid compartment is divided into three main
subdivisions: intravascular fluid (blood plasma), interstitial fluid (fluid between
cells), and transcellular fluid (cerebrospinal fluid, synovial fluid, pleural fluid,
etc.). The intracellular fluid is separate from the extracellular compartment.
Understanding these subdivisions is essential for understanding fluid shifts and
clinical hydration status.
---
Question 3
Which of the following describes the composition of the intracellular fluid
compartment?
A) High sodium and low potassium
B) Low sodium and high potassium
C) Equal sodium and potassium
D) High calcium and low magnesium
Answer: B
Rationale: The intracellular fluid contains a high concentration of potassium and
low concentration of sodium. This composition is maintained by the sodium-
,potassium pump, which actively transports sodium out of cells and potassium into
cells. This gradient is essential for nerve impulse transmission, muscle contraction,
and cellular volume regulation.
---
Question 4
The primary extracellular cation is:
A) Potassium
B) Magnesium
C) Sodium
D) Calcium
Answer: C
Rationale: Sodium is the most abundant cation in the extracellular fluid. It plays a
critical role in regulating fluid balance, nerve impulse transmission, and muscle
contraction. The concentration gradient between extracellular sodium and
intracellular potassium is maintained by the sodium-potassium ATPase pump,
which is essential for cellular function.
---
Question 5
The primary intracellular cation is:
A) Sodium
B) Potassium
C) Chloride
D) Bicarbonate
Answer: B
Rationale: Potassium is the primary cation within the intracellular compartment.
Approximately 98% of the body's potassium is located inside cells. This
intracellular concentration is crucial for maintaining the resting membrane
potential, enabling nerve impulse conduction, and facilitating muscle contraction,
including cardiac muscle function.
, ---
Question 6
Osmolarity is defined as:
A) The number of solute particles per liter of solution
B) The number of solute particles per kilogram of solvent
C) The pressure required to prevent osmosis
D) The movement of water across a membrane
Answer: A
Rationale: Osmolarity is the concentration of solute particles expressed as osmoles
per liter of solution. It is a measure of the total solute concentration in a solution.
Osmolality, by contrast, is expressed as osmoles per kilogram of solvent. Both
terms are used in clinical practice to evaluate fluid balance and guide treatment
decisions.
---
Question 7
The osmotic pressure of plasma is primarily determined by which protein?
A) Globulin
B) Fibrinogen
C) Albumin
D) Hemoglobin
Answer: C
Rationale: Albumin is the most abundant plasma protein and is the primary
determinant of plasma oncotic pressure, which is the osmotic pressure exerted by
proteins. Albumin accounts for approximately 80% of the plasma oncotic pressure.
Low albumin levels reduce plasma oncotic pressure, leading to fluid shifts into the
interstitial space and subsequent edema.
---
Question 8
What is the term for the pressure that tends to push water out of the capillary?
AND ACID–BASE IMBALANCES EXAM 300 ACTUAL
QUESTIONS AND CORRECT ANSWERS WITH
RATIONALE LATEST UPDATE ALREADY GRADED A+
ASSURED PASS
This 300-question examination resource provides a comprehensive review of fluid,
electrolyte, and acid-base pathophysiology for nursing students. Organized into six
sections, it covers body fluid compartments, osmotic forces, hormonal regulation,
fluid volume disorders, electrolyte imbalances (sodium, potassium, calcium,
magnesium, phosphate), and acid-base disturbances with ABG interpretation. Each
question includes multiple-choice options, correct answers, and detailed rationales
explaining physiological mechanisms, clinical manifestations, diagnostic findings,
and nursing interventions. The progressive difficulty and clinical scenarios
promote critical thinking and application of pathophysiological concepts. This
evidence-based study tool supports exam preparation and clinical reasoning
development for NR-283 and similar pathophysiology courses.
Section 1: Body Fluid Compartments and Composition (Questions 1-50)
Question 1
Total body water accounts for approximately what percentage of body weight in a
healthy adult?
A) 40%
B) 50%
C) 60%
D) 70%
Answer: C
,Rationale: Total body water accounts for approximately 60% of body weight in a
healthy adult. This percentage varies with age, gender, and body fat composition.
Infants have a higher percentage of body water (about 75%), while elderly
individuals and those with more adipose tissue have a lower percentage. The
remaining 40% of body weight consists of solids such as bone, muscle, and fat.
---
Question 2
The extracellular fluid compartment includes which of the following subdivisions?
A) Intravascular, interstitial, and transcellular
B) Intravascular and intracellular
C) Interstitial and intracellular
D) Plasma and cytosol
Answer: A
Rationale: The extracellular fluid compartment is divided into three main
subdivisions: intravascular fluid (blood plasma), interstitial fluid (fluid between
cells), and transcellular fluid (cerebrospinal fluid, synovial fluid, pleural fluid,
etc.). The intracellular fluid is separate from the extracellular compartment.
Understanding these subdivisions is essential for understanding fluid shifts and
clinical hydration status.
---
Question 3
Which of the following describes the composition of the intracellular fluid
compartment?
A) High sodium and low potassium
B) Low sodium and high potassium
C) Equal sodium and potassium
D) High calcium and low magnesium
Answer: B
Rationale: The intracellular fluid contains a high concentration of potassium and
low concentration of sodium. This composition is maintained by the sodium-
,potassium pump, which actively transports sodium out of cells and potassium into
cells. This gradient is essential for nerve impulse transmission, muscle contraction,
and cellular volume regulation.
---
Question 4
The primary extracellular cation is:
A) Potassium
B) Magnesium
C) Sodium
D) Calcium
Answer: C
Rationale: Sodium is the most abundant cation in the extracellular fluid. It plays a
critical role in regulating fluid balance, nerve impulse transmission, and muscle
contraction. The concentration gradient between extracellular sodium and
intracellular potassium is maintained by the sodium-potassium ATPase pump,
which is essential for cellular function.
---
Question 5
The primary intracellular cation is:
A) Sodium
B) Potassium
C) Chloride
D) Bicarbonate
Answer: B
Rationale: Potassium is the primary cation within the intracellular compartment.
Approximately 98% of the body's potassium is located inside cells. This
intracellular concentration is crucial for maintaining the resting membrane
potential, enabling nerve impulse conduction, and facilitating muscle contraction,
including cardiac muscle function.
, ---
Question 6
Osmolarity is defined as:
A) The number of solute particles per liter of solution
B) The number of solute particles per kilogram of solvent
C) The pressure required to prevent osmosis
D) The movement of water across a membrane
Answer: A
Rationale: Osmolarity is the concentration of solute particles expressed as osmoles
per liter of solution. It is a measure of the total solute concentration in a solution.
Osmolality, by contrast, is expressed as osmoles per kilogram of solvent. Both
terms are used in clinical practice to evaluate fluid balance and guide treatment
decisions.
---
Question 7
The osmotic pressure of plasma is primarily determined by which protein?
A) Globulin
B) Fibrinogen
C) Albumin
D) Hemoglobin
Answer: C
Rationale: Albumin is the most abundant plasma protein and is the primary
determinant of plasma oncotic pressure, which is the osmotic pressure exerted by
proteins. Albumin accounts for approximately 80% of the plasma oncotic pressure.
Low albumin levels reduce plasma oncotic pressure, leading to fluid shifts into the
interstitial space and subsequent edema.
---
Question 8
What is the term for the pressure that tends to push water out of the capillary?
