HSC 4555 Exam 3 V1 | HSC 4555 Pathophysiology 1 | Actual Q&A with
Rationale (HSC4555 Exam 3) | University of Central Florida
1. A 45-year-old female presents with exophthalmos, heat intolerance, and a diffuse goiter.
Which of the following is the most likely underlying mechanism?
A. Autoimmune destruction of thyroid follicles
B. Iodine deficiency leading to thyroid hypertrophy
C. Pituitary adenoma secreting excessive TSH
D. Thyroid-stimulating immunoglobulins (TSI) binding to TSH receptors
Answer: D
Explanation: Graves’ disease is an autoimmune disorder where antibodies mimic TSH and
stimulate the thyroid gland. This leads to excessive production of T3 and T4, resulting in
hyperthyroidism symptoms. The presence of exophthalmos is specific to Graves due to
fibroblast activation in the orbital tissue.
2. Which clinical manifestation is a hallmark of Nephrotic Syndrome?
A. Hematuria and hypertension
B. Oliguria and increased serum creatinine
C. Proteinuria exceeding 3.5 g/day and generalized edema
D. Colicky flank pain radiating to the groin
Answer: C
Explanation: Nephrotic syndrome is characterized by heavy proteinuria due to increased
glomerular permeability. The loss of albumin leads to decreased plasma oncotic pressure,
resulting in systemic edema. Patients typically exhibit hyperlipidemia and lipiduria as the
liver compensates for protein loss.
3. What is the primary pathophysiology behind the development of esophageal varices in
patients with liver cirrhosis?
A. Portal hypertension causing blood to shunt into collateral vessels
B. Decreased production of clotting factors
C. Direct acid reflux into the distal esophagus
D. Chronic inflammation of the esophageal mucosa
Answer: A
,Explanation: Liver cirrhosis leads to structural changes that increase resistance to blood
flow through the portal vein. This portal hypertension forces blood into lower-pressure
systemic veins, such as those in the esophagus. These vessels become dilated and fragile,
posing a significant risk for life-threatening hemorrhage.
4. A patient with Type 1 Diabetes Mellitus presents with Kussmaul respirations and a fruity
breath odor. What is the most likely diagnosis?
A. Hyperosmolar Hyperglycemic State (HHS)
B. Diabetic Ketoacidosis (DKA)
C. Hypoglycemic shock
D. Lactic acidosis from metformin use
Answer: B
Explanation: DKA occurs when a total lack of insulin leads to the breakdown of fats for
energy, producing acidic ketones. The Kussmaul respirations are a compensatory
mechanism to blow off CO2 and correct metabolic acidosis. Fruity breath is caused by the
excretion of acetone through the lungs.
5. Which of the following describes the pathophysiology of a prerenal Acute Kidney Injury
(AKI)?
A. Obstruction of the urinary tract by a tumor
B. Damage to the renal tubules from nephrotoxic drugs
C. Decreased renal perfusion due to systemic hypovolemia
D. Inflammation of the glomerular basement membrane
Answer: C
Explanation: Prerenal AKI is caused by factors external to the kidneys that reduce blood
flow, such as dehydration or heart failure. Without adequate perfusion, the GFR drops,
leading to azotemia. If the underlying cause is not corrected, it can progress to intrinsic
renal damage.
6. In Cushing’s Syndrome, the characteristic ‘moon face’ and ‘buffalo hump’ are caused by:
A. Increased protein synthesis in muscles
B. Water retention caused by hypernatremia
C. Excessive cortisol leading to abnormal fat redistribution
D. Increased growth hormone secretion
Answer: C
, Explanation: Cushing’s syndrome involves chronic exposure to high levels of
glucocorticoids like cortisol. Cortisol stimulates lipogenesis in specific areas while causing
lipolysis in the limbs. This results in the classic centripetal obesity pattern observed in
these patients.
7. Which bacteria is most commonly associated with the development of Peptic Ulcer Disease
(PUD)?
A. Escherichia coli
B. Staphylococcus aureus
C. Clostridium difficile
D. Helicobacter pylori
Answer: D
Explanation: Helicobacter pylori is a gram-negative bacterium that colonizes the gastric
mucosa and produces urease. This creates an alkaline environment that allows it to survive
stomach acid and trigger inflammatory responses. The inflammation weakens the mucosal
barrier, leading to ulcer formation.
8. A 60-year-old male with a history of smoking presents with painless hematuria. Which
condition should be highly suspected?
A. Bladder cancer
B. Acute cystitis
C. Benign Prostatic Hyperplasia (BPH)
D. Renal calculi
Answer: A
Explanation: Painless gross hematuria in an older adult, especially one with a smoking
history, is a classic warning sign of urothelial carcinoma. Tobacco smoke contains
carcinogens that are excreted in urine and irritate the bladder lining. Early cystoscopy is
required to rule out malignancy.
9. Which hormone is deficiency in Diabetes Insipidus?
A. Insulin
B. Aldosterone
C. Oxytocin
D. Antidiuretic Hormone (ADH)
Answer: D
Rationale (HSC4555 Exam 3) | University of Central Florida
1. A 45-year-old female presents with exophthalmos, heat intolerance, and a diffuse goiter.
Which of the following is the most likely underlying mechanism?
A. Autoimmune destruction of thyroid follicles
B. Iodine deficiency leading to thyroid hypertrophy
C. Pituitary adenoma secreting excessive TSH
D. Thyroid-stimulating immunoglobulins (TSI) binding to TSH receptors
Answer: D
Explanation: Graves’ disease is an autoimmune disorder where antibodies mimic TSH and
stimulate the thyroid gland. This leads to excessive production of T3 and T4, resulting in
hyperthyroidism symptoms. The presence of exophthalmos is specific to Graves due to
fibroblast activation in the orbital tissue.
2. Which clinical manifestation is a hallmark of Nephrotic Syndrome?
A. Hematuria and hypertension
B. Oliguria and increased serum creatinine
C. Proteinuria exceeding 3.5 g/day and generalized edema
D. Colicky flank pain radiating to the groin
Answer: C
Explanation: Nephrotic syndrome is characterized by heavy proteinuria due to increased
glomerular permeability. The loss of albumin leads to decreased plasma oncotic pressure,
resulting in systemic edema. Patients typically exhibit hyperlipidemia and lipiduria as the
liver compensates for protein loss.
3. What is the primary pathophysiology behind the development of esophageal varices in
patients with liver cirrhosis?
A. Portal hypertension causing blood to shunt into collateral vessels
B. Decreased production of clotting factors
C. Direct acid reflux into the distal esophagus
D. Chronic inflammation of the esophageal mucosa
Answer: A
,Explanation: Liver cirrhosis leads to structural changes that increase resistance to blood
flow through the portal vein. This portal hypertension forces blood into lower-pressure
systemic veins, such as those in the esophagus. These vessels become dilated and fragile,
posing a significant risk for life-threatening hemorrhage.
4. A patient with Type 1 Diabetes Mellitus presents with Kussmaul respirations and a fruity
breath odor. What is the most likely diagnosis?
A. Hyperosmolar Hyperglycemic State (HHS)
B. Diabetic Ketoacidosis (DKA)
C. Hypoglycemic shock
D. Lactic acidosis from metformin use
Answer: B
Explanation: DKA occurs when a total lack of insulin leads to the breakdown of fats for
energy, producing acidic ketones. The Kussmaul respirations are a compensatory
mechanism to blow off CO2 and correct metabolic acidosis. Fruity breath is caused by the
excretion of acetone through the lungs.
5. Which of the following describes the pathophysiology of a prerenal Acute Kidney Injury
(AKI)?
A. Obstruction of the urinary tract by a tumor
B. Damage to the renal tubules from nephrotoxic drugs
C. Decreased renal perfusion due to systemic hypovolemia
D. Inflammation of the glomerular basement membrane
Answer: C
Explanation: Prerenal AKI is caused by factors external to the kidneys that reduce blood
flow, such as dehydration or heart failure. Without adequate perfusion, the GFR drops,
leading to azotemia. If the underlying cause is not corrected, it can progress to intrinsic
renal damage.
6. In Cushing’s Syndrome, the characteristic ‘moon face’ and ‘buffalo hump’ are caused by:
A. Increased protein synthesis in muscles
B. Water retention caused by hypernatremia
C. Excessive cortisol leading to abnormal fat redistribution
D. Increased growth hormone secretion
Answer: C
, Explanation: Cushing’s syndrome involves chronic exposure to high levels of
glucocorticoids like cortisol. Cortisol stimulates lipogenesis in specific areas while causing
lipolysis in the limbs. This results in the classic centripetal obesity pattern observed in
these patients.
7. Which bacteria is most commonly associated with the development of Peptic Ulcer Disease
(PUD)?
A. Escherichia coli
B. Staphylococcus aureus
C. Clostridium difficile
D. Helicobacter pylori
Answer: D
Explanation: Helicobacter pylori is a gram-negative bacterium that colonizes the gastric
mucosa and produces urease. This creates an alkaline environment that allows it to survive
stomach acid and trigger inflammatory responses. The inflammation weakens the mucosal
barrier, leading to ulcer formation.
8. A 60-year-old male with a history of smoking presents with painless hematuria. Which
condition should be highly suspected?
A. Bladder cancer
B. Acute cystitis
C. Benign Prostatic Hyperplasia (BPH)
D. Renal calculi
Answer: A
Explanation: Painless gross hematuria in an older adult, especially one with a smoking
history, is a classic warning sign of urothelial carcinoma. Tobacco smoke contains
carcinogens that are excreted in urine and irritate the bladder lining. Early cystoscopy is
required to rule out malignancy.
9. Which hormone is deficiency in Diabetes Insipidus?
A. Insulin
B. Aldosterone
C. Oxytocin
D. Antidiuretic Hormone (ADH)
Answer: D
