NR 507 Final Exam: Advanced Pathophysiology V4
Updated and Latest Questions and Correct Answers with
Rationale
1. Which cellular adaptation process involves the replacement of one mature cell type by
another, less mature cell type?
A. Atrophy
B. Hypertrophy
C. Metaplasia
D. Dysplasia
Ans: C
Rationale: Metaplasia is the reversible replacement of one mature cell by another often less
differentiated cell type. This process usually occurs in response to chronic irritation or inflammation in
the body. For example, bronchial cells change from ciliated to squamous in response to smoking. Unlike
dysplasia, metaplasia is not necessarily a precancerous condition but can become one. The new cells are
better suited to survive the stressful environment but lose function. Understanding this adaptation helps
clinicians recognize early tissue changes in chronic disease.
,2. Which of the following is a characteristic of malignant tumors compared to benign
tumors?
A. Slow growth rate
B. Well-defined capsule
C. Low degree of metastasis
D. High mitotic index
Ans: D
Rationale: Malignant tumors are characterized by rapid growth and a high mitotic index indicating
frequent cell division. Unlike benign tumors, they lack a well-defined capsule and can invade surrounding
tissues. They are typically poorly differentiated, which is a state referred to as anaplasia. The ability to
metastasize to distant organs is a hallmark of malignancy. This invasive nature makes them much more
dangerous than their benign counterparts. Recognizing these features is vital for staging and grading
cancers in clinical practice.
3. In the context of fluid and electrolyte balance, what is the primary cause of
hypernatremia?
A. Excessive water intake
B. Excessive potassium loss
C. Increased sodium intake or decreased water intake
D. Syndrome of inappropriate antidiuretic hormone (SIADH)
Ans: C
,Rationale: Hypernatremia occurs when serum sodium levels rise above the normal range of 145 mEq/L.
This is most commonly caused by a net water loss or an acute gain of sodium. Dehydration from
insufficient water intake or excessive sweating can lead to concentrated sodium levels. In contrast, SIADH
usually causes hyponatremia due to water retention. Clinical manifestations often involve the central
nervous system, such as confusion or seizures. Correcting the underlying water deficit is the primary goal
of treatment for these patients.
4. Which type of hypersensitivity reaction is mediated by IgE and involves the release of
histamine from mast cells?
A. Type III
B. Type II
C. Type I
D. Type IV
Ans: C
Rationale: Type I hypersensitivity is an immediate allergic reaction mediated by IgE antibodies. When an
allergen binds to IgE on mast cells, it triggers degranulation and the release of histamine. This chemical
mediator causes vasodilation, increased capillary permeability, and smooth muscle contraction. Common
examples include seasonal allergies, asthma, and life-threatening anaphylaxis. Types II and III involve IgG
or IgM antibodies, while Type IV is cell-mediated. Proper identification of the trigger is essential for
managing patients with these hypersensitivity profiles.
, 5. What is the primary pathophysiology behind the development of Type 1 Diabetes
Mellitus?
A. Autoimmune destruction of pancreatic beta cells
B. Insulin resistance in peripheral tissues
C. Excessive production of glucagon
D. Inhibition of insulin receptors by cortisol
Ans: A
Rationale: Type 1 Diabetes Mellitus results from an autoimmune-mediated destruction of insulin-
producing beta cells in the pancreas. This leads to an absolute deficiency of insulin, requiring exogenous
insulin for survival. The onset is typically abrupt and often occurs during childhood or adolescence. It is
distinct from Type 2 Diabetes, which primarily involves insulin resistance rather than cell destruction.
Without insulin, glucose cannot enter cells, leading to hyperglycemia and ketoacidosis. Managing this
condition requires lifelong monitoring of blood glucose and insulin administration.
6. Which valvular disorder is characterized by the failure of the valve leaflets to close
completely, allowing blood to flow backward?
A. Regurgitation
B. Stenosis
C. Atresia
D. Sclerosis
Ans: A
Updated and Latest Questions and Correct Answers with
Rationale
1. Which cellular adaptation process involves the replacement of one mature cell type by
another, less mature cell type?
A. Atrophy
B. Hypertrophy
C. Metaplasia
D. Dysplasia
Ans: C
Rationale: Metaplasia is the reversible replacement of one mature cell by another often less
differentiated cell type. This process usually occurs in response to chronic irritation or inflammation in
the body. For example, bronchial cells change from ciliated to squamous in response to smoking. Unlike
dysplasia, metaplasia is not necessarily a precancerous condition but can become one. The new cells are
better suited to survive the stressful environment but lose function. Understanding this adaptation helps
clinicians recognize early tissue changes in chronic disease.
,2. Which of the following is a characteristic of malignant tumors compared to benign
tumors?
A. Slow growth rate
B. Well-defined capsule
C. Low degree of metastasis
D. High mitotic index
Ans: D
Rationale: Malignant tumors are characterized by rapid growth and a high mitotic index indicating
frequent cell division. Unlike benign tumors, they lack a well-defined capsule and can invade surrounding
tissues. They are typically poorly differentiated, which is a state referred to as anaplasia. The ability to
metastasize to distant organs is a hallmark of malignancy. This invasive nature makes them much more
dangerous than their benign counterparts. Recognizing these features is vital for staging and grading
cancers in clinical practice.
3. In the context of fluid and electrolyte balance, what is the primary cause of
hypernatremia?
A. Excessive water intake
B. Excessive potassium loss
C. Increased sodium intake or decreased water intake
D. Syndrome of inappropriate antidiuretic hormone (SIADH)
Ans: C
,Rationale: Hypernatremia occurs when serum sodium levels rise above the normal range of 145 mEq/L.
This is most commonly caused by a net water loss or an acute gain of sodium. Dehydration from
insufficient water intake or excessive sweating can lead to concentrated sodium levels. In contrast, SIADH
usually causes hyponatremia due to water retention. Clinical manifestations often involve the central
nervous system, such as confusion or seizures. Correcting the underlying water deficit is the primary goal
of treatment for these patients.
4. Which type of hypersensitivity reaction is mediated by IgE and involves the release of
histamine from mast cells?
A. Type III
B. Type II
C. Type I
D. Type IV
Ans: C
Rationale: Type I hypersensitivity is an immediate allergic reaction mediated by IgE antibodies. When an
allergen binds to IgE on mast cells, it triggers degranulation and the release of histamine. This chemical
mediator causes vasodilation, increased capillary permeability, and smooth muscle contraction. Common
examples include seasonal allergies, asthma, and life-threatening anaphylaxis. Types II and III involve IgG
or IgM antibodies, while Type IV is cell-mediated. Proper identification of the trigger is essential for
managing patients with these hypersensitivity profiles.
, 5. What is the primary pathophysiology behind the development of Type 1 Diabetes
Mellitus?
A. Autoimmune destruction of pancreatic beta cells
B. Insulin resistance in peripheral tissues
C. Excessive production of glucagon
D. Inhibition of insulin receptors by cortisol
Ans: A
Rationale: Type 1 Diabetes Mellitus results from an autoimmune-mediated destruction of insulin-
producing beta cells in the pancreas. This leads to an absolute deficiency of insulin, requiring exogenous
insulin for survival. The onset is typically abrupt and often occurs during childhood or adolescence. It is
distinct from Type 2 Diabetes, which primarily involves insulin resistance rather than cell destruction.
Without insulin, glucose cannot enter cells, leading to hyperglycemia and ketoacidosis. Managing this
condition requires lifelong monitoring of blood glucose and insulin administration.
6. Which valvular disorder is characterized by the failure of the valve leaflets to close
completely, allowing blood to flow backward?
A. Regurgitation
B. Stenosis
C. Atresia
D. Sclerosis
Ans: A
