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BIOL252 Human Anatomy & Physiology II with Lab
Module 8 Exam Actual Exam 2026/2027 – Complete
Exam-Style Questions with Detailed Rationales | 100%
Verified – Pass Guaranteed – A+ Graded
Body Fluid Compartments & Fluid Balance
Q1: If a 70 kg adult male has approximately 42 liters of total body water (TBW), roughly how
much of that volume would be classified as intracellular fluid (ICF)?
A. 14 liters
B. 28 liters
C. 35 liters
D. 21 liters
Correct Answer: B
Rationale: This is correct because intracellular fluid makes up about two-thirds (roughly 40% of
body weight or 2/3 of TBW) of the body's total water, leaving the remaining one-third for
extracellular fluid.
Q2: Which of the following statements best describes the composition of interstitial fluid (IF)
compared to plasma?
A. IF has a much higher protein concentration than plasma.
B. IF is essentially plasma without the plasma proteins.
C. IF contains significantly more sodium than plasma.
D. IF has a higher concentration of red blood cells.
Correct Answer: B
Rationale: Interstitial fluid is very similar to plasma in terms of electrolyte composition, but it
differs because plasma proteins (like albumin) are generally too large to cross the capillary walls
easily, so they remain mostly in the plasma.
Q3: In a clinical setting, a patient is diagnosed with edema in the lower extremities. Which of the
following mechanisms is most likely causing the accumulation of fluid in the interstitial space?
,2
A. Decreased capillary hydrostatic pressure
B. Increased plasma oncotic pressure
C. Increased capillary permeability due to inflammation
D. Blocked lymphatic drainage returning fluid to the heart
Correct Answer: C
Rationale: Inflammation causes the capillaries to become "leaky," allowing proteins and fluid to
escape into the interstitial space more easily, which disrupts the normal fluid balance and leads to
swelling.
Q4: When assessing a patient's hydration status, you notice that their skin "tents" when pinched.
What specific type of fluid imbalance does this sign typically indicate?
A. Overhydration (water excess)
B. Isotonic fluid loss
C. Severe dehydration (water loss exceeding sodium loss)
D. Hypotonic hydration
Correct Answer: C
Rationale: Skin tenting is a classic sign of significant dehydration; the skin loses its elasticity
(turgor) because there isn't enough interstitial fluid to support the skin's structure.
Q5: Which of the following triggers the thirst mechanism most effectively under normal
physiological conditions?
A. An increase in blood volume
B. A decrease in plasma osmolarity
C. An increase in plasma osmolarity (dry mouth)
D. A drop in blood pressure detected by baroreceptors
Correct Answer: C
Rationale: The primary trigger for thirst is an increase in the concentration of solutes in the blood
(increased osmolarity), which causes the osmoreceptors in the hypothalamus to signal the need
for water intake.
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Q6: A patient is unable to produce ADH (antidiuretic hormone) due to head trauma. Which of the
following would you expect to occur?
A. Large volumes of dilute urine
B. Retention of water and concentrated urine
C. Extreme thirst and low urine output
D. Increased blood pressure
Correct Answer: A
Rationale: Without ADH, the collecting ducts in the kidneys remain impermeable to water,
preventing water reabsorption and leading to the excretion of large amounts of dilute urine.
Q7: Which body fluid compartment acts as the transport system for nutrients, gases, and wastes
throughout the body?
A. Intracellular fluid (ICF)
B. Interstitial fluid (IF)
C. Plasma
D. Cerebrospinal fluid
Correct Answer: C
Rationale: Plasma is the fluid portion of blood within the cardiovascular system, making it the
main highway for moving essential substances to and from cells.
Q8: An elderly patient complains of dizziness when standing up quickly. Considering age-related
changes in fluid balance, which factor is most likely contributing to this?
A. Decreased total body water percentage
B. Increased thirst sensation
C. Increased kidney efficiency
D. Higher muscle mass
Correct Answer: A
BIOL252 Human Anatomy & Physiology II with Lab
Module 8 Exam Actual Exam 2026/2027 – Complete
Exam-Style Questions with Detailed Rationales | 100%
Verified – Pass Guaranteed – A+ Graded
Body Fluid Compartments & Fluid Balance
Q1: If a 70 kg adult male has approximately 42 liters of total body water (TBW), roughly how
much of that volume would be classified as intracellular fluid (ICF)?
A. 14 liters
B. 28 liters
C. 35 liters
D. 21 liters
Correct Answer: B
Rationale: This is correct because intracellular fluid makes up about two-thirds (roughly 40% of
body weight or 2/3 of TBW) of the body's total water, leaving the remaining one-third for
extracellular fluid.
Q2: Which of the following statements best describes the composition of interstitial fluid (IF)
compared to plasma?
A. IF has a much higher protein concentration than plasma.
B. IF is essentially plasma without the plasma proteins.
C. IF contains significantly more sodium than plasma.
D. IF has a higher concentration of red blood cells.
Correct Answer: B
Rationale: Interstitial fluid is very similar to plasma in terms of electrolyte composition, but it
differs because plasma proteins (like albumin) are generally too large to cross the capillary walls
easily, so they remain mostly in the plasma.
Q3: In a clinical setting, a patient is diagnosed with edema in the lower extremities. Which of the
following mechanisms is most likely causing the accumulation of fluid in the interstitial space?
,2
A. Decreased capillary hydrostatic pressure
B. Increased plasma oncotic pressure
C. Increased capillary permeability due to inflammation
D. Blocked lymphatic drainage returning fluid to the heart
Correct Answer: C
Rationale: Inflammation causes the capillaries to become "leaky," allowing proteins and fluid to
escape into the interstitial space more easily, which disrupts the normal fluid balance and leads to
swelling.
Q4: When assessing a patient's hydration status, you notice that their skin "tents" when pinched.
What specific type of fluid imbalance does this sign typically indicate?
A. Overhydration (water excess)
B. Isotonic fluid loss
C. Severe dehydration (water loss exceeding sodium loss)
D. Hypotonic hydration
Correct Answer: C
Rationale: Skin tenting is a classic sign of significant dehydration; the skin loses its elasticity
(turgor) because there isn't enough interstitial fluid to support the skin's structure.
Q5: Which of the following triggers the thirst mechanism most effectively under normal
physiological conditions?
A. An increase in blood volume
B. A decrease in plasma osmolarity
C. An increase in plasma osmolarity (dry mouth)
D. A drop in blood pressure detected by baroreceptors
Correct Answer: C
Rationale: The primary trigger for thirst is an increase in the concentration of solutes in the blood
(increased osmolarity), which causes the osmoreceptors in the hypothalamus to signal the need
for water intake.
, 3
Q6: A patient is unable to produce ADH (antidiuretic hormone) due to head trauma. Which of the
following would you expect to occur?
A. Large volumes of dilute urine
B. Retention of water and concentrated urine
C. Extreme thirst and low urine output
D. Increased blood pressure
Correct Answer: A
Rationale: Without ADH, the collecting ducts in the kidneys remain impermeable to water,
preventing water reabsorption and leading to the excretion of large amounts of dilute urine.
Q7: Which body fluid compartment acts as the transport system for nutrients, gases, and wastes
throughout the body?
A. Intracellular fluid (ICF)
B. Interstitial fluid (IF)
C. Plasma
D. Cerebrospinal fluid
Correct Answer: C
Rationale: Plasma is the fluid portion of blood within the cardiovascular system, making it the
main highway for moving essential substances to and from cells.
Q8: An elderly patient complains of dizziness when standing up quickly. Considering age-related
changes in fluid balance, which factor is most likely contributing to this?
A. Decreased total body water percentage
B. Increased thirst sensation
C. Increased kidney efficiency
D. Higher muscle mass
Correct Answer: A
