WGU C805 Pathophysiology Objective
Assessment: The Complete Question
& Answer Guide for V1, V2 & V3 —
Questions with Rationales
Cellular Adaptation & Injury
What is the primary feature of cellular adaptation?
Answer: Reversible structural or functional change.
Rationale: Adaptation allows cells to survive stress through reversible
changes; permanent cell death, immediate infection response, and genetic
mutation alone do not define adaptation.
Which condition is characterized by hypoxia-induced cell injury?
Answer: Ischemia.
Rationale: Ischemia reduces oxygen supply to tissues, causing hypoxic
injury.
Apoptosis is best described as:
Answer: Programmed cell death.
Rationale: Apoptosis is a regulated, controlled process of cell death, unlike
uncontrolled necrosis or infectious destruction.
Which cellular adaptation increases cell size?
Answer: Hypertrophy.
,Rationale: Hypertrophy refers to an increase in cell size in response to
increased workload or stimulation.
Which cellular adaptation increases cell number?
Answer: Hyperplasia.
Rationale: Hyperplasia is an increase in the number of cells in a tissue or
organ.
Metaplasia is best described as:
Answer: Replacement of one differentiated cell type with another.
Rationale: Metaplasia is a reversible change where one adult cell type is
replaced by another, often in response to chronic irritation.
Dysplasia is characterized by:
Answer: Abnormal changes in cell size, shape, and organization.
Rationale: Dysplasia involves disordered cellular growth and is often a
precursor to malignancy.
What is the most common cause of cellular injury?
Answer: Hypoxia.
Rationale: Hypoxia, or oxygen deprivation, is the most frequent cause of
cellular injury and death.
Reperfusion injury occurs when:
Answer: Blood flow is restored to ischemic tissue, causing additional
damage.
Rationale: Restoration of blood flow can trigger inflammation and oxidative
stress, worsening tissue injury.
Free radical injury causes cell damage through:
Answer: Lipid peroxidation of cell membranes.
Rationale: Free radicals attack unsaturated fatty acids in cell membranes,
disrupting membrane integrity.
,Necrosis is characterized by:
Answer: Unregulated cell death with inflammation.
Rationale: Necrosis is accidental, unprogrammed cell death that typically
triggers an inflammatory response.
Coagulative necrosis is most commonly seen in:
Answer: Myocardial infarction.
Rationale: Coagulative necrosis preserves tissue architecture for days and is
typical of ischemic injury in solid organs.
Liquefactive necrosis is characteristic of:
Answer: Brain infarction.
Rationale: The brain has high lipid content, leading to liquefaction following
ischemic injury.
Caseous necrosis is associated with:
Answer: Tuberculosis.
Rationale: Caseous necrosis produces a cheese-like appearance and is
characteristic of mycobacterial infections.
Fat necrosis is most commonly caused by:
Answer: Pancreatic enzyme release in acute pancreatitis.
Rationale: Lipases break down triglycerides into fatty acids, which combine
with calcium to form soap-like deposits.
Gangrenous necrosis involves:
Answer: Tissue death complicated by secondary infection.
Rationale: Gangrene occurs when necrotic tissue becomes infected, often in
extremities with compromised blood flow.
What is the hallmark of irreversible cell injury?
Answer: Severe mitochondrial damage and membrane disruption.
, Rationale: Once mitochondria are severely damaged and cell membranes
lose integrity, cell death is inevitable.
Cellular swelling is an early sign of:
Answer: Reversible cell injury.
Rationale: Loss of ATP leads to failure of the sodium-potassium pump,
causing cellular edema.
Fatty change (steatosis) most commonly affects:
Answer: The liver.
Rationale: The liver is the primary site of fat metabolism and is most
susceptible to fatty accumulation.
What is the primary energy source for cellular function?
Answer: ATP (adenosine triphosphate).
Rationale: ATP provides the energy necessary for all cellular metabolic
activities.
Inflammation & Immune Response
A hallmark of inflammation is:
Answer: Redness and swelling.
Rationale: Inflammation increases blood flow and vascular permeability,
producing redness (rubor) and swelling (tumor).
Histamine is primarily released by:
Answer: Mast cells.
Rationale: Mast cells are the primary source of histamine, which triggers
vasodilation and allergic responses.
Which leukocyte is most active in acute bacterial infection?
Answer: Neutrophils.
Assessment: The Complete Question
& Answer Guide for V1, V2 & V3 —
Questions with Rationales
Cellular Adaptation & Injury
What is the primary feature of cellular adaptation?
Answer: Reversible structural or functional change.
Rationale: Adaptation allows cells to survive stress through reversible
changes; permanent cell death, immediate infection response, and genetic
mutation alone do not define adaptation.
Which condition is characterized by hypoxia-induced cell injury?
Answer: Ischemia.
Rationale: Ischemia reduces oxygen supply to tissues, causing hypoxic
injury.
Apoptosis is best described as:
Answer: Programmed cell death.
Rationale: Apoptosis is a regulated, controlled process of cell death, unlike
uncontrolled necrosis or infectious destruction.
Which cellular adaptation increases cell size?
Answer: Hypertrophy.
,Rationale: Hypertrophy refers to an increase in cell size in response to
increased workload or stimulation.
Which cellular adaptation increases cell number?
Answer: Hyperplasia.
Rationale: Hyperplasia is an increase in the number of cells in a tissue or
organ.
Metaplasia is best described as:
Answer: Replacement of one differentiated cell type with another.
Rationale: Metaplasia is a reversible change where one adult cell type is
replaced by another, often in response to chronic irritation.
Dysplasia is characterized by:
Answer: Abnormal changes in cell size, shape, and organization.
Rationale: Dysplasia involves disordered cellular growth and is often a
precursor to malignancy.
What is the most common cause of cellular injury?
Answer: Hypoxia.
Rationale: Hypoxia, or oxygen deprivation, is the most frequent cause of
cellular injury and death.
Reperfusion injury occurs when:
Answer: Blood flow is restored to ischemic tissue, causing additional
damage.
Rationale: Restoration of blood flow can trigger inflammation and oxidative
stress, worsening tissue injury.
Free radical injury causes cell damage through:
Answer: Lipid peroxidation of cell membranes.
Rationale: Free radicals attack unsaturated fatty acids in cell membranes,
disrupting membrane integrity.
,Necrosis is characterized by:
Answer: Unregulated cell death with inflammation.
Rationale: Necrosis is accidental, unprogrammed cell death that typically
triggers an inflammatory response.
Coagulative necrosis is most commonly seen in:
Answer: Myocardial infarction.
Rationale: Coagulative necrosis preserves tissue architecture for days and is
typical of ischemic injury in solid organs.
Liquefactive necrosis is characteristic of:
Answer: Brain infarction.
Rationale: The brain has high lipid content, leading to liquefaction following
ischemic injury.
Caseous necrosis is associated with:
Answer: Tuberculosis.
Rationale: Caseous necrosis produces a cheese-like appearance and is
characteristic of mycobacterial infections.
Fat necrosis is most commonly caused by:
Answer: Pancreatic enzyme release in acute pancreatitis.
Rationale: Lipases break down triglycerides into fatty acids, which combine
with calcium to form soap-like deposits.
Gangrenous necrosis involves:
Answer: Tissue death complicated by secondary infection.
Rationale: Gangrene occurs when necrotic tissue becomes infected, often in
extremities with compromised blood flow.
What is the hallmark of irreversible cell injury?
Answer: Severe mitochondrial damage and membrane disruption.
, Rationale: Once mitochondria are severely damaged and cell membranes
lose integrity, cell death is inevitable.
Cellular swelling is an early sign of:
Answer: Reversible cell injury.
Rationale: Loss of ATP leads to failure of the sodium-potassium pump,
causing cellular edema.
Fatty change (steatosis) most commonly affects:
Answer: The liver.
Rationale: The liver is the primary site of fat metabolism and is most
susceptible to fatty accumulation.
What is the primary energy source for cellular function?
Answer: ATP (adenosine triphosphate).
Rationale: ATP provides the energy necessary for all cellular metabolic
activities.
Inflammation & Immune Response
A hallmark of inflammation is:
Answer: Redness and swelling.
Rationale: Inflammation increases blood flow and vascular permeability,
producing redness (rubor) and swelling (tumor).
Histamine is primarily released by:
Answer: Mast cells.
Rationale: Mast cells are the primary source of histamine, which triggers
vasodilation and allergic responses.
Which leukocyte is most active in acute bacterial infection?
Answer: Neutrophils.
