NUR 546/NUR546 Final Exam V1 |
Advanced Pathophysiology Q&A with
Rationale | William Paterson University
1. Which mechanism is primarily responsible for the development of pulmonary edema in a
patient with left-sided heart failure?
A. Increased permeability of the alveolar-capillary membrane
B. Decreased oncotic pressure in the pulmonary vessels
C. Obstruction of the lymphatic drainage in the lungs
D. Increased pulmonary capillary hydrostatic pressure
Answer: D
Rationale: Left-sided heart failure leads to a backup of blood into the pulmonary
circulation. This congestion increases the hydrostatic pressure within the pulmonary
capillaries, forcing fluid into the interstitial spaces and alveoli. As the pressure exceeds the
ability of the lymphatic system to drain it, clinical pulmonary edema develops.
2. In the pathogenesis of Type 2 Diabetes Mellitus, what is the core defect regarding insulin?
A. Absolute deficiency of insulin production
B. Insulin resistance and relative insulin deficiency
C. Destruction of pancreatic alpha cells
D. Increased sensitivity of GLUT-4 transporters
,Answer: B
Rationale: Type 2 Diabetes involves a combination of insulin resistance in peripheral
tissues and an inadequate compensatory secretion of insulin by the pancreas. Initially, the
body produces more insulin to overcome resistance, but eventually, beta-cell exhaustion
occurs. This leads to chronic hyperglycemia and the various complications associated with
the disease.
3. What is the underlying cause of the tremors and muscle rigidity seen in Parkinson’s
disease?
A. Excessive production of dopamine in the basal ganglia
B. Autoimmune destruction of acetylcholine receptors
C. Degeneration of dopaminergic neurons in the substantia nigra
D. Demyelination of the axons in the central nervous system
Answer: C
Rationale: Parkinson’s disease is characterized by the loss of dopamine-producing
neurons in the substantia nigra pars compacta. Dopamine is essential for inhibiting
unwanted movements and facilitating smooth motor control. The resulting imbalance
between dopamine and acetylcholine leads to the classic motor symptoms such as
bradykinesia and resting tremors.
4. Which of the following describes the pathophysiology of Grave’s disease?
A. Thyroid-stimulating immunoglobulin (TSI) mimicking TSH
, B. Autoimmune destruction of the thyroid follicles
C. Iodine deficiency leading to goiter formation
D. Pituitary adenoma secreting excessive TSH
Answer: A
Rationale: Grave’s disease is an autoimmune disorder where the body produces antibodies
known as thyroid-stimulating immunoglobulins. These antibodies bind to and activate the
TSH receptors on the thyroid gland, leading to overproduction of thyroid hormones. This
results in hyperthyroidism, characterized by weight loss, tachycardia, and exophthalmos.
5. Which acid-base imbalance is expected in a patient with severe, prolonged vomiting?
A. Metabolic Acidosis
B. Metabolic Alkalosis
C. Respiratory Acidosis
D. Respiratory Alkalosis
Answer: B
Rationale: Vomiting causes the loss of gastric secretions, which are highly acidic and
contain high concentrations of hydrochloric acid. This loss of hydrogen ions leads to an
increase in the plasma bicarbonate concentration. Consequently, the body shifts into a state
of metabolic alkalosis as the blood pH rises.
Advanced Pathophysiology Q&A with
Rationale | William Paterson University
1. Which mechanism is primarily responsible for the development of pulmonary edema in a
patient with left-sided heart failure?
A. Increased permeability of the alveolar-capillary membrane
B. Decreased oncotic pressure in the pulmonary vessels
C. Obstruction of the lymphatic drainage in the lungs
D. Increased pulmonary capillary hydrostatic pressure
Answer: D
Rationale: Left-sided heart failure leads to a backup of blood into the pulmonary
circulation. This congestion increases the hydrostatic pressure within the pulmonary
capillaries, forcing fluid into the interstitial spaces and alveoli. As the pressure exceeds the
ability of the lymphatic system to drain it, clinical pulmonary edema develops.
2. In the pathogenesis of Type 2 Diabetes Mellitus, what is the core defect regarding insulin?
A. Absolute deficiency of insulin production
B. Insulin resistance and relative insulin deficiency
C. Destruction of pancreatic alpha cells
D. Increased sensitivity of GLUT-4 transporters
,Answer: B
Rationale: Type 2 Diabetes involves a combination of insulin resistance in peripheral
tissues and an inadequate compensatory secretion of insulin by the pancreas. Initially, the
body produces more insulin to overcome resistance, but eventually, beta-cell exhaustion
occurs. This leads to chronic hyperglycemia and the various complications associated with
the disease.
3. What is the underlying cause of the tremors and muscle rigidity seen in Parkinson’s
disease?
A. Excessive production of dopamine in the basal ganglia
B. Autoimmune destruction of acetylcholine receptors
C. Degeneration of dopaminergic neurons in the substantia nigra
D. Demyelination of the axons in the central nervous system
Answer: C
Rationale: Parkinson’s disease is characterized by the loss of dopamine-producing
neurons in the substantia nigra pars compacta. Dopamine is essential for inhibiting
unwanted movements and facilitating smooth motor control. The resulting imbalance
between dopamine and acetylcholine leads to the classic motor symptoms such as
bradykinesia and resting tremors.
4. Which of the following describes the pathophysiology of Grave’s disease?
A. Thyroid-stimulating immunoglobulin (TSI) mimicking TSH
, B. Autoimmune destruction of the thyroid follicles
C. Iodine deficiency leading to goiter formation
D. Pituitary adenoma secreting excessive TSH
Answer: A
Rationale: Grave’s disease is an autoimmune disorder where the body produces antibodies
known as thyroid-stimulating immunoglobulins. These antibodies bind to and activate the
TSH receptors on the thyroid gland, leading to overproduction of thyroid hormones. This
results in hyperthyroidism, characterized by weight loss, tachycardia, and exophthalmos.
5. Which acid-base imbalance is expected in a patient with severe, prolonged vomiting?
A. Metabolic Acidosis
B. Metabolic Alkalosis
C. Respiratory Acidosis
D. Respiratory Alkalosis
Answer: B
Rationale: Vomiting causes the loss of gastric secretions, which are highly acidic and
contain high concentrations of hydrochloric acid. This loss of hydrogen ions leads to an
increase in the plasma bicarbonate concentration. Consequently, the body shifts into a state
of metabolic alkalosis as the blood pH rises.
