BIOD 102 Portage Learning - Lab 4 Exam
(Homeostasis) (2026/2027)
Section 1: Measuring Homeostatic Parameters
Q1: In the 2026/2027 clinical standards, which of the following is classified as a core
physiological parameter that requires continuous electronic monitoring during systemic
perturbation labs?
A. Capillary refill time
B. Core body temperature [CORRECT]
C. Subjective pain score
D. Peripheral skin color
Correct Answer: B
Rationale: Core body temperature is an objective, quantifiable physiological parameter
measured continuously via electronic probes during perturbation labs; pain scores are subjective,
while capillary refill and skin color are episodic, qualitative assessments.
Q2: A Portage Learning virtual lab student is performing auscultatory blood pressure
measurement and hears Korotkoff sounds at 140 mmHg, silence at 125 mmHg, and sounds again
at 120 mmHg until 80 mmHg where they disappear. What is the correct recorded blood pressure?
A. 140/125 mmHg
B. 140/80 mmHg [CORRECT]
C. 120/80 mmHg
D. 125/80 mmHg
Correct Answer: B
Rationale: The auscultatory gap is a temporary disappearance of sound and should be ignored;
systolic pressure is the first sound (140) and diastolic is the last sound heard (80), making 140/80
correct.
.
,Q3: During a virtual thermoregulation lab, a subject's non-contact infrared skin temperature
reads 34.5°C while their ingestible gastrointestinal pill reads 37.2°C. Why is the skin temperature
significantly lower?
A. The infrared device is miscalibrated according to 2026 standards
B. Skin temperature represents peripheral heat loss to the environment, not core
temperature [CORRECT]
C. The gastrointestinal pill is absorbing heat from digestive enzymes
D. Skin blood flow is maximally vasodilated, increasing heat loss
Correct Answer: B
Rationale: Skin temperature is always lower than core temperature due to heat dissipation from
the body's surface to the environment; the difference reflects normal thermoregulatory gradients,
not miscalibration or localized heat production.
Q4: Which of the following devices is utilized in modern 2026 exercise physiology labs to
provide the most accurate continuous measurement of respiratory rate without a facial mask?
A. Pulse oximetry photoplethysmography
B. Impedance pneumography chest strap [CORRECT]
C. Nasal thermistor probe
D. Capnography end-tidal CO2 sensor
Correct Answer: B
Rationale: Impedance pneumography measures changes in chest cavity electrical impedance
with each breath, allowing continuous, non-facial respiratory rate monitoring; pulse oximetry is
for SpO2, and thermistors/capnography require facial attachment.
Q5: A subject in the virtual lab has the following orthostatic vital signs: Lying (HR 68 bpm, BP
120/80 mmHg); Standing at 1 minute (HR 75 bpm, BP 115/78 mmHg). How should this data be
interpreted?
A. Severe hypovolemia indicated by a drop in blood pressure
B. Orthostatic hypotension with inadequate compensatory tachycardia
C. Normal physiological response to postural change [CORRECT]
.
, D. Baroreceptor failure due to an excessive heart rate increase
Correct Answer: C
Rationale: A systolic drop of < 20 mmHg and a heart rate increase of < 15 bpm upon standing is
a normal homeostatic response; hypovolemia would present with a >20 mmHg drop and >15
bpm tachycardia.
Q6: A student analyzes a urine sample from a virtual patient and records a specific gravity of
1.003 and a clear, colorless appearance. What does this indicate about the patient's hydration
status?
A. Severe dehydration with maximal ADH secretion
B. Normal hydration with balanced fluid intake
C. Overhydration or excessive free water intake [CORRECT]
D. Renal failure causing proteinuria
Correct Answer: C
Rationale: A very low urine specific gravity (<1.005) indicates highly dilute urine, typical of
overhydration where ADH is suppressed to excrete excess free water; dehydration would yield
concentrated urine (SG >1.030).
Q7: In a virtual glucose monitoring exercise, a fasting subject's capillary blood glucose is 95
mg/dL, and 2 hours after a standardized meal it is 135 mg/dL. According to 2026 diagnostic
criteria, these results are classified as:
A. Diabetic
B. Euglycemic (normal) [CORRECT]
C. Prediabetic
D. Reactive hypoglycemic
Correct Answer: B
Rationale: Normal fasting glucose is <100 mg/dL and normal 2-hour postprandial is <140
mg/dL; since both values fall within these homeostatic limits, the subject is euglycemic.
.
(Homeostasis) (2026/2027)
Section 1: Measuring Homeostatic Parameters
Q1: In the 2026/2027 clinical standards, which of the following is classified as a core
physiological parameter that requires continuous electronic monitoring during systemic
perturbation labs?
A. Capillary refill time
B. Core body temperature [CORRECT]
C. Subjective pain score
D. Peripheral skin color
Correct Answer: B
Rationale: Core body temperature is an objective, quantifiable physiological parameter
measured continuously via electronic probes during perturbation labs; pain scores are subjective,
while capillary refill and skin color are episodic, qualitative assessments.
Q2: A Portage Learning virtual lab student is performing auscultatory blood pressure
measurement and hears Korotkoff sounds at 140 mmHg, silence at 125 mmHg, and sounds again
at 120 mmHg until 80 mmHg where they disappear. What is the correct recorded blood pressure?
A. 140/125 mmHg
B. 140/80 mmHg [CORRECT]
C. 120/80 mmHg
D. 125/80 mmHg
Correct Answer: B
Rationale: The auscultatory gap is a temporary disappearance of sound and should be ignored;
systolic pressure is the first sound (140) and diastolic is the last sound heard (80), making 140/80
correct.
.
,Q3: During a virtual thermoregulation lab, a subject's non-contact infrared skin temperature
reads 34.5°C while their ingestible gastrointestinal pill reads 37.2°C. Why is the skin temperature
significantly lower?
A. The infrared device is miscalibrated according to 2026 standards
B. Skin temperature represents peripheral heat loss to the environment, not core
temperature [CORRECT]
C. The gastrointestinal pill is absorbing heat from digestive enzymes
D. Skin blood flow is maximally vasodilated, increasing heat loss
Correct Answer: B
Rationale: Skin temperature is always lower than core temperature due to heat dissipation from
the body's surface to the environment; the difference reflects normal thermoregulatory gradients,
not miscalibration or localized heat production.
Q4: Which of the following devices is utilized in modern 2026 exercise physiology labs to
provide the most accurate continuous measurement of respiratory rate without a facial mask?
A. Pulse oximetry photoplethysmography
B. Impedance pneumography chest strap [CORRECT]
C. Nasal thermistor probe
D. Capnography end-tidal CO2 sensor
Correct Answer: B
Rationale: Impedance pneumography measures changes in chest cavity electrical impedance
with each breath, allowing continuous, non-facial respiratory rate monitoring; pulse oximetry is
for SpO2, and thermistors/capnography require facial attachment.
Q5: A subject in the virtual lab has the following orthostatic vital signs: Lying (HR 68 bpm, BP
120/80 mmHg); Standing at 1 minute (HR 75 bpm, BP 115/78 mmHg). How should this data be
interpreted?
A. Severe hypovolemia indicated by a drop in blood pressure
B. Orthostatic hypotension with inadequate compensatory tachycardia
C. Normal physiological response to postural change [CORRECT]
.
, D. Baroreceptor failure due to an excessive heart rate increase
Correct Answer: C
Rationale: A systolic drop of < 20 mmHg and a heart rate increase of < 15 bpm upon standing is
a normal homeostatic response; hypovolemia would present with a >20 mmHg drop and >15
bpm tachycardia.
Q6: A student analyzes a urine sample from a virtual patient and records a specific gravity of
1.003 and a clear, colorless appearance. What does this indicate about the patient's hydration
status?
A. Severe dehydration with maximal ADH secretion
B. Normal hydration with balanced fluid intake
C. Overhydration or excessive free water intake [CORRECT]
D. Renal failure causing proteinuria
Correct Answer: C
Rationale: A very low urine specific gravity (<1.005) indicates highly dilute urine, typical of
overhydration where ADH is suppressed to excrete excess free water; dehydration would yield
concentrated urine (SG >1.030).
Q7: In a virtual glucose monitoring exercise, a fasting subject's capillary blood glucose is 95
mg/dL, and 2 hours after a standardized meal it is 135 mg/dL. According to 2026 diagnostic
criteria, these results are classified as:
A. Diabetic
B. Euglycemic (normal) [CORRECT]
C. Prediabetic
D. Reactive hypoglycemic
Correct Answer: B
Rationale: Normal fasting glucose is <100 mg/dL and normal 2-hour postprandial is <140
mg/dL; since both values fall within these homeostatic limits, the subject is euglycemic.
.
