HSC 4555 Exam 4 V2 | HSC 4555 Pathophysiology 1 | Actual Q&A with
Rationale (HSC4555 Exam 4) | University of Central Florida
1. Which of the following is the primary pathophysiological mechanism behind Type 1
Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Failure of the pituitary gland to signal the pancreas
C. Excessive secretion of glucagon by alpha cells
D. Autoimmune destruction of pancreatic beta cells
Answer: D
Explanation: Type 1 Diabetes Mellitus is characterized by an absolute insulin deficiency
due to the destruction of beta cells. This is typically an immune-mediated process where T-
cells attack the pancreatic islets. Consequently, patients require exogenous insulin to
prevent ketoacidosis and maintain metabolic control.
2. A patient presents with exophthalmos, heat intolerance, and a diffuse goiter. Which
condition is most likely?
A. Hashimoto thyroiditis
B. Addison disease
C. Myxedema coma
D. Graves disease
Answer: D
Explanation: Graves disease is a form of hyperthyroidism caused by thyroid-stimulating
immunoglobulins that bind to TSH receptors. The unique clinical sign of exophthalmos
(bulging eyes) is caused by inflammation and fat accumulation behind the eyes. This
condition leads to an overproduction of thyroid hormones, resulting in a hypermetabolic
state.
3. In Chronic Kidney Disease (CKD), why does anemia commonly occur?
A. Increased destruction of red blood cells in the spleen
B. Decreased production of erythropoietin by the kidneys
C. Iron deficiency due to poor dietary intake
D. Chronic blood loss through the urinary tract
Answer: B
,Explanation: The kidneys are the primary site for the production of erythropoietin, the
hormone that stimulates red blood cell production in the bone marrow. As renal function
declines in CKD, the production of this hormone decreases significantly. This leads to a
normochromic, normocytic anemia that often requires synthetic erythropoietin
replacement.
4. Which electrolyte imbalance is most characteristic of the oliguric phase of Acute Kidney
Injury (AKI)?
A. Hyperkalemia
B. Hypokalemia
C. Hypernatremia
D. Hypophosphatemia
Answer: A
Explanation: During the oliguric phase of AKI, the kidneys fail to adequately excrete
potassium, leading to dangerous elevations in serum levels. Hyperkalemia is a critical
concern because it can lead to fatal cardiac arrhythmias. Management usually involves
monitoring the EKG and using agents to shift potassium back into cells or remove it from
the body.
5. A patient is diagnosed with Cushing syndrome. Which clinical finding would be most
expected?
A. Weight loss and hypoglycemia
B. Truncal obesity and moon face
C. Hypotension and hyperkalemia
D. Hyperpigmentation of the skin
Answer: B
Explanation: Cushing syndrome results from chronic exposure to excessive levels of
cortisol, regardless of the cause. The metabolic effects of excess cortisol include abnormal
fat distribution, leading to the characteristic ‘moon face’ and ‘buffalo hump.’ Patients also
commonly experience muscle wasting in the extremities and skin thinning.
6. What is the primary difference between Crohn’s disease and Ulcerative Colitis (UC)?
A. UC involves the entire thickness of the intestinal wall.
B. Crohn’s disease can affect any part of the GI tract and features skip lesions.
C. Crohn’s disease is limited to the mucosal layer of the colon.
D. UC commonly causes fistula formation between bowel loops.
, Answer: B
Explanation: Crohn’s disease is a transmural inflammatory process that can occur
anywhere from the mouth to the anus, often leaving healthy tissue between affected
segments (skip lesions). In contrast, Ulcerative Colitis is confined to the colon and rectum
and only affects the mucosal layer. The transmural nature of Crohn’s makes it more prone
to complications like fistulas and abscesses.
7. Which hormone is deficient in Diabetes Insipidus?
A. Insulin
B. Antidiuretic Hormone (ADH)
C. Aldosterone
D. Oxytocin
Answer: B
Explanation: Diabetes Insipidus results from either a lack of Antidiuretic Hormone (ADH)
production or a lack of renal response to it. This leads to the inability of the kidneys to
concentrate urine, resulting in polyuria and polydipsia. Patients must be carefully
monitored for dehydration and electrolyte imbalances such as hypernatremia.
8. What is the hallmark finding of Nephrotic Syndrome?
A. Gross hematuria
B. Proteinuria exceeding 3.5 grams per day
C. Elevated serum albumin
D. Low serum cholesterol
Answer: B
Explanation: Nephrotic Syndrome is defined by massive proteinuria resulting from
increased glomerular permeability. This loss of protein leads to hypoalbuminemia, which
in turn causes a decrease in plasma oncotic pressure and widespread edema. Additionally,
the liver compensates for protein loss by increasing lipid synthesis, leading to
hyperlipidemia.
9. In the pathogenesis of Peptic Ulcer Disease (PUD), which factor is most frequently
implicated?
A. Excessive intake of spicy foods
B. Psychological stress
C. Infection with Helicobacter pylori
D. Hyposecretion of gastrin
Rationale (HSC4555 Exam 4) | University of Central Florida
1. Which of the following is the primary pathophysiological mechanism behind Type 1
Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Failure of the pituitary gland to signal the pancreas
C. Excessive secretion of glucagon by alpha cells
D. Autoimmune destruction of pancreatic beta cells
Answer: D
Explanation: Type 1 Diabetes Mellitus is characterized by an absolute insulin deficiency
due to the destruction of beta cells. This is typically an immune-mediated process where T-
cells attack the pancreatic islets. Consequently, patients require exogenous insulin to
prevent ketoacidosis and maintain metabolic control.
2. A patient presents with exophthalmos, heat intolerance, and a diffuse goiter. Which
condition is most likely?
A. Hashimoto thyroiditis
B. Addison disease
C. Myxedema coma
D. Graves disease
Answer: D
Explanation: Graves disease is a form of hyperthyroidism caused by thyroid-stimulating
immunoglobulins that bind to TSH receptors. The unique clinical sign of exophthalmos
(bulging eyes) is caused by inflammation and fat accumulation behind the eyes. This
condition leads to an overproduction of thyroid hormones, resulting in a hypermetabolic
state.
3. In Chronic Kidney Disease (CKD), why does anemia commonly occur?
A. Increased destruction of red blood cells in the spleen
B. Decreased production of erythropoietin by the kidneys
C. Iron deficiency due to poor dietary intake
D. Chronic blood loss through the urinary tract
Answer: B
,Explanation: The kidneys are the primary site for the production of erythropoietin, the
hormone that stimulates red blood cell production in the bone marrow. As renal function
declines in CKD, the production of this hormone decreases significantly. This leads to a
normochromic, normocytic anemia that often requires synthetic erythropoietin
replacement.
4. Which electrolyte imbalance is most characteristic of the oliguric phase of Acute Kidney
Injury (AKI)?
A. Hyperkalemia
B. Hypokalemia
C. Hypernatremia
D. Hypophosphatemia
Answer: A
Explanation: During the oliguric phase of AKI, the kidneys fail to adequately excrete
potassium, leading to dangerous elevations in serum levels. Hyperkalemia is a critical
concern because it can lead to fatal cardiac arrhythmias. Management usually involves
monitoring the EKG and using agents to shift potassium back into cells or remove it from
the body.
5. A patient is diagnosed with Cushing syndrome. Which clinical finding would be most
expected?
A. Weight loss and hypoglycemia
B. Truncal obesity and moon face
C. Hypotension and hyperkalemia
D. Hyperpigmentation of the skin
Answer: B
Explanation: Cushing syndrome results from chronic exposure to excessive levels of
cortisol, regardless of the cause. The metabolic effects of excess cortisol include abnormal
fat distribution, leading to the characteristic ‘moon face’ and ‘buffalo hump.’ Patients also
commonly experience muscle wasting in the extremities and skin thinning.
6. What is the primary difference between Crohn’s disease and Ulcerative Colitis (UC)?
A. UC involves the entire thickness of the intestinal wall.
B. Crohn’s disease can affect any part of the GI tract and features skip lesions.
C. Crohn’s disease is limited to the mucosal layer of the colon.
D. UC commonly causes fistula formation between bowel loops.
, Answer: B
Explanation: Crohn’s disease is a transmural inflammatory process that can occur
anywhere from the mouth to the anus, often leaving healthy tissue between affected
segments (skip lesions). In contrast, Ulcerative Colitis is confined to the colon and rectum
and only affects the mucosal layer. The transmural nature of Crohn’s makes it more prone
to complications like fistulas and abscesses.
7. Which hormone is deficient in Diabetes Insipidus?
A. Insulin
B. Antidiuretic Hormone (ADH)
C. Aldosterone
D. Oxytocin
Answer: B
Explanation: Diabetes Insipidus results from either a lack of Antidiuretic Hormone (ADH)
production or a lack of renal response to it. This leads to the inability of the kidneys to
concentrate urine, resulting in polyuria and polydipsia. Patients must be carefully
monitored for dehydration and electrolyte imbalances such as hypernatremia.
8. What is the hallmark finding of Nephrotic Syndrome?
A. Gross hematuria
B. Proteinuria exceeding 3.5 grams per day
C. Elevated serum albumin
D. Low serum cholesterol
Answer: B
Explanation: Nephrotic Syndrome is defined by massive proteinuria resulting from
increased glomerular permeability. This loss of protein leads to hypoalbuminemia, which
in turn causes a decrease in plasma oncotic pressure and widespread edema. Additionally,
the liver compensates for protein loss by increasing lipid synthesis, leading to
hyperlipidemia.
9. In the pathogenesis of Peptic Ulcer Disease (PUD), which factor is most frequently
implicated?
A. Excessive intake of spicy foods
B. Psychological stress
C. Infection with Helicobacter pylori
D. Hyposecretion of gastrin
