NURSING PATHOPHYSIOLOGY — EXAM 4
COMPLETE STUDY GUIDE 300 QUESTIONS WITH
VERIFIED ANSWERS & DETAILED RATIONALES|
LATEST UPDATE| 2026/2027| BRAND NEW!!
1. Which principle best describes homeostasis?
A. Complete absence of physiologic change
B. Maintenance of a relatively stable internal environment
C. Permanent suppression of stress responses
D. Elimination of all external influences
Correct Answer: B. Maintenance of a relatively stable internal environment
Rationale: Homeostasis refers to the body's ability to maintain relatively stable internal
conditions despite internal or external changes. It depends on coordinated regulatory
mechanisms involving multiple organ systems.
2. Which component of a homeostatic control system detects a change in the internal
environment?
A. Effector
B. Receptor
C. Hormone
D. Target organ
Correct Answer: B. Receptor
Rationale: Receptors detect changes in a regulated variable. The information is transmitted to a
control center, which determines an appropriate response through effectors.
3. Negative feedback primarily functions to:
A. Amplify a physiologic change indefinitely
B. Reverse or reduce the initial stimulus
C. Prevent all physiologic responses
D. Cause permanent tissue injury
Correct Answer: B. Reverse or reduce the initial stimulus
,Rationale: Negative feedback maintains stability by producing a response that opposes the
original change. Regulation of blood glucose and body temperature are common examples.
4. Which is an example of positive feedback?
A. Regulation of body temperature
B. Blood glucose regulation
C. Labor contractions during childbirth
D. Regulation of serum sodium
Correct Answer: C. Labor contractions during childbirth
Rationale: Positive feedback amplifies an existing response. During labor, uterine contractions
stimulate oxytocin release, which strengthens contractions until delivery occurs.
5. Adaptation refers to:
A. A cellular response that helps an organism tolerate stress
B. Immediate cell death
C. Permanent loss of all cellular function
D. Complete elimination of disease
Correct Answer: A. A cellular response that helps an organism tolerate stress
Rationale: Cells can adapt to changes in workload or environmental conditions. Hypertrophy,
hyperplasia, atrophy, and metaplasia are examples of cellular adaptations.
6. Which cellular adaptation involves an increase in cell size?
A. Atrophy
B. Hypertrophy
C. Hyperplasia
D. Metaplasia
Correct Answer: B. Hypertrophy
Rationale: Hypertrophy is an increase in the size of individual cells. It can occur when cells
experience increased workload, such as cardiac muscle in chronic hypertension.
,7. Which cellular adaptation involves an increase in the number of cells?
A. Hypertrophy
B. Atrophy
C. Hyperplasia
D. Necrosis
Correct Answer: C. Hyperplasia
Rationale: Hyperplasia occurs when cell proliferation increases the number of cells within a
tissue. It may be physiologic or pathologic depending on the stimulus.
8. Atrophy is characterized by:
A. Increased cell size
B. Reduced cell size or tissue mass
C. Increased cell number
D. Transformation into malignant cells
Correct Answer: B. Reduced cell size or tissue mass
Rationale: Atrophy involves reduction in cellular size and sometimes number, resulting in
decreased tissue mass. Disuse, inadequate nutrition, and loss of hormonal stimulation can
contribute.
9. Metaplasia refers to:
A. Reversible replacement of one mature cell type with another
B. Irreversible cell death
C. Increased cellular ATP production
D. Formation of blood clots
Correct Answer: A. Reversible replacement of one mature cell type with another
Rationale: Metaplasia is an adaptive response in which one differentiated cell type is replaced
by another better able to tolerate chronic stress. Persistent injury can increase the risk of
dysplasia.
10. Which cellular change is generally considered irreversible?
, A. Mild cellular swelling
B. Fatty change
C. Severe membrane and mitochondrial damage leading to cell death
D. Physiologic hypertrophy
Correct Answer: C. Severe membrane and mitochondrial damage leading to cell death
Rationale: Mild injury may be reversible, but severe mitochondrial dysfunction, membrane
damage, and inability to restore cellular homeostasis can result in irreversible injury and death.
11. Necrosis commonly causes:
A. No inflammatory response
B. Inflammation in surrounding tissue
C. Controlled cellular shrinkage without leakage
D. Normal tissue regeneration only
Correct Answer: B. Inflammation in surrounding tissue
Rationale: Necrotic cells lose membrane integrity and release intracellular contents, which can
trigger inflammation in surrounding tissues.
12. Apoptosis is best described as:
A. Uncontrolled cell rupture
B. Programmed cell death
C. Severe tissue infection
D. Vascular obstruction
Correct Answer: B. Programmed cell death
Rationale: Apoptosis is a regulated process of cellular elimination. Unlike necrosis, it generally
occurs without the extensive inflammatory response associated with cell membrane rupture.
13. Which organelle is the major site of aerobic ATP production?
A. Ribosome
B. Lysosome
C. Mitochondrion
D. Golgi apparatus
COMPLETE STUDY GUIDE 300 QUESTIONS WITH
VERIFIED ANSWERS & DETAILED RATIONALES|
LATEST UPDATE| 2026/2027| BRAND NEW!!
1. Which principle best describes homeostasis?
A. Complete absence of physiologic change
B. Maintenance of a relatively stable internal environment
C. Permanent suppression of stress responses
D. Elimination of all external influences
Correct Answer: B. Maintenance of a relatively stable internal environment
Rationale: Homeostasis refers to the body's ability to maintain relatively stable internal
conditions despite internal or external changes. It depends on coordinated regulatory
mechanisms involving multiple organ systems.
2. Which component of a homeostatic control system detects a change in the internal
environment?
A. Effector
B. Receptor
C. Hormone
D. Target organ
Correct Answer: B. Receptor
Rationale: Receptors detect changes in a regulated variable. The information is transmitted to a
control center, which determines an appropriate response through effectors.
3. Negative feedback primarily functions to:
A. Amplify a physiologic change indefinitely
B. Reverse or reduce the initial stimulus
C. Prevent all physiologic responses
D. Cause permanent tissue injury
Correct Answer: B. Reverse or reduce the initial stimulus
,Rationale: Negative feedback maintains stability by producing a response that opposes the
original change. Regulation of blood glucose and body temperature are common examples.
4. Which is an example of positive feedback?
A. Regulation of body temperature
B. Blood glucose regulation
C. Labor contractions during childbirth
D. Regulation of serum sodium
Correct Answer: C. Labor contractions during childbirth
Rationale: Positive feedback amplifies an existing response. During labor, uterine contractions
stimulate oxytocin release, which strengthens contractions until delivery occurs.
5. Adaptation refers to:
A. A cellular response that helps an organism tolerate stress
B. Immediate cell death
C. Permanent loss of all cellular function
D. Complete elimination of disease
Correct Answer: A. A cellular response that helps an organism tolerate stress
Rationale: Cells can adapt to changes in workload or environmental conditions. Hypertrophy,
hyperplasia, atrophy, and metaplasia are examples of cellular adaptations.
6. Which cellular adaptation involves an increase in cell size?
A. Atrophy
B. Hypertrophy
C. Hyperplasia
D. Metaplasia
Correct Answer: B. Hypertrophy
Rationale: Hypertrophy is an increase in the size of individual cells. It can occur when cells
experience increased workload, such as cardiac muscle in chronic hypertension.
,7. Which cellular adaptation involves an increase in the number of cells?
A. Hypertrophy
B. Atrophy
C. Hyperplasia
D. Necrosis
Correct Answer: C. Hyperplasia
Rationale: Hyperplasia occurs when cell proliferation increases the number of cells within a
tissue. It may be physiologic or pathologic depending on the stimulus.
8. Atrophy is characterized by:
A. Increased cell size
B. Reduced cell size or tissue mass
C. Increased cell number
D. Transformation into malignant cells
Correct Answer: B. Reduced cell size or tissue mass
Rationale: Atrophy involves reduction in cellular size and sometimes number, resulting in
decreased tissue mass. Disuse, inadequate nutrition, and loss of hormonal stimulation can
contribute.
9. Metaplasia refers to:
A. Reversible replacement of one mature cell type with another
B. Irreversible cell death
C. Increased cellular ATP production
D. Formation of blood clots
Correct Answer: A. Reversible replacement of one mature cell type with another
Rationale: Metaplasia is an adaptive response in which one differentiated cell type is replaced
by another better able to tolerate chronic stress. Persistent injury can increase the risk of
dysplasia.
10. Which cellular change is generally considered irreversible?
, A. Mild cellular swelling
B. Fatty change
C. Severe membrane and mitochondrial damage leading to cell death
D. Physiologic hypertrophy
Correct Answer: C. Severe membrane and mitochondrial damage leading to cell death
Rationale: Mild injury may be reversible, but severe mitochondrial dysfunction, membrane
damage, and inability to restore cellular homeostasis can result in irreversible injury and death.
11. Necrosis commonly causes:
A. No inflammatory response
B. Inflammation in surrounding tissue
C. Controlled cellular shrinkage without leakage
D. Normal tissue regeneration only
Correct Answer: B. Inflammation in surrounding tissue
Rationale: Necrotic cells lose membrane integrity and release intracellular contents, which can
trigger inflammation in surrounding tissues.
12. Apoptosis is best described as:
A. Uncontrolled cell rupture
B. Programmed cell death
C. Severe tissue infection
D. Vascular obstruction
Correct Answer: B. Programmed cell death
Rationale: Apoptosis is a regulated process of cellular elimination. Unlike necrosis, it generally
occurs without the extensive inflammatory response associated with cell membrane rupture.
13. Which organelle is the major site of aerobic ATP production?
A. Ribosome
B. Lysosome
C. Mitochondrion
D. Golgi apparatus
