HSC 4555 Exam 4 V1 | HSC 4555 Pathophysiology 1 | Actual Q&A with
Rationale (HSC4555 Exam 4) | University of Central Florida
1. A patient presents with polyuria, nocturia, and a urine specific gravity of 1.002. Which
condition is most likely based on these clinical findings?
A. Diabetes Insipidus
B. Hyperaldosteronism
C. SIADH
D. Type 2 Diabetes Mellitus
Answer: A
Explanation: Diabetes Insipidus is caused by a deficiency of ADH or a decreased renal
response to ADH, leading to the excretion of large volumes of dilute urine. The low specific
gravity indicates that the kidneys are unable to concentrate urine effectively. This
condition often results in compensatory polydipsia to maintain fluid balance.
2. Which of the following is a hallmark manifestation of the Syndrome of Inappropriate
Antidiuretic Hormone (SIADH)?
A. Hypernatremia
B. Dilutional hyponatremia
C. Increased serum osmolarity
D. Polyuria
Answer: B
Explanation: SIADH involves the excessive release of ADH, which causes the kidneys to
reabsorb too much water back into the bloodstream. This excess water dilutes the sodium
in the blood, leading to hyponatremia and a decrease in serum osmolarity. Clinical
symptoms often include weight gain without edema and neurological changes due to
cerebral swelling.
3. Acromegaly in adults is most commonly caused by an overproduction of which hormone?
A. Prolactin
B. Thyroid Stimulating Hormone
C. Adrenocorticotropic Hormone
D. Growth Hormone
Answer: D
,Explanation: Acromegaly occurs when the pituitary gland produces excess Growth
Hormone after the epiphyseal plates have closed. This leads to the thickening of bones and
soft tissues, particularly in the face, hands, and feet. If this hypersecretion occurred before
the closure of growth plates, it would result in gigantism.
4. Graves’ disease is characterized by which of the following pathophysiological mechanisms?
A. Autoimmune destruction of thyroid follicular cells
B. Inadequate iodine intake leading to goiter
C. Production of thyroid-stimulating immunoglobulins (TSI)
D. Pituitary adenoma secreting excessive TSH
Answer: C
Explanation: Graves’ disease is an autoimmune disorder where antibodies mimic TSH and
bind to thyroid receptors, causing the gland to overproduce thyroid hormone. This leads to
symptoms of hyperthyroidism such as heat intolerance, weight loss, and tachycardia.
Exophthalmos is a unique clinical sign often associated with this specific condition.
5. A patient with Hashimoto’s thyroiditis would most likely exhibit which laboratory profile?
A. Low TSH and high T3/T4
B. High TSH and low T3/T4
C. High TSH and high T3/T4
D. Low TSH and low T3/T4
Answer: B
Explanation: Hashimoto’s thyroiditis is an autoimmune condition where the thyroid gland
is destroyed, leading to primary hypothyroidism. Because the thyroid cannot produce
enough T3 and T4, the pituitary gland increases TSH production in a failed attempt to
stimulate the thyroid. This negative feedback loop results in the characteristic high TSH
and low hormone levels.
6. What is the most severe and life-threatening form of hypothyroidism?
A. Thyroid Storm
B. Addisonian Crisis
C. Cushing’s Crisis
D. Myxedema Coma
Answer: D
Explanation: Myxedema coma is a medical emergency characterized by extreme lethargy,
hypothermia, and respiratory depression. It represents the decompensated state of severe,
, untreated hypothyroidism. Immediate intervention is required to address the metabolic
and cardiovascular collapse associated with this state.
7. A patient with hyperparathyroidism is at high risk for which of the following
complications?
A. Hypocalcemia
B. Tetany
C. Pathological fractures and renal calculi
D. Positive Chvostek’s sign
Answer: C
Explanation: Hyperparathyroidism leads to excessive secretion of parathyroid hormone,
which pulls calcium from the bones into the blood. This results in hypercalcemia, which can
lead to the formation of kidney stones and weakened bone structure. The excess calcium in
the blood often causes symptoms like fatigue and muscle weakness.
8. Which clinical sign is indicative of hypocalcemia, often seen in hypoparathyroidism?
A. Buffalo hump
B. Exophthalmos
C. Moon face
D. Positive Trousseau’s sign
Answer: D
Explanation: Trousseau’s sign is a carpal spasm induced by inflating a blood pressure cuff,
indicating neuromuscular irritability due to low calcium. Another common sign is
Chvostek’s sign, which is a twitching of the facial muscle when the facial nerve is tapped.
These signs are critical for identifying acute electrolyte imbalances that could lead to
seizures or laryngospasm.
9. Cushing’s Syndrome is caused by a chronic excess of which hormone?
A. Aldosterone
B. Epinephrine
C. Cortisol
D. Antidiuretic Hormone
Answer: C
Explanation: Cushing’s Syndrome results from prolonged exposure to high levels of
glucocorticoids, either from endogenous production or exogenous steroid use. Common
Rationale (HSC4555 Exam 4) | University of Central Florida
1. A patient presents with polyuria, nocturia, and a urine specific gravity of 1.002. Which
condition is most likely based on these clinical findings?
A. Diabetes Insipidus
B. Hyperaldosteronism
C. SIADH
D. Type 2 Diabetes Mellitus
Answer: A
Explanation: Diabetes Insipidus is caused by a deficiency of ADH or a decreased renal
response to ADH, leading to the excretion of large volumes of dilute urine. The low specific
gravity indicates that the kidneys are unable to concentrate urine effectively. This
condition often results in compensatory polydipsia to maintain fluid balance.
2. Which of the following is a hallmark manifestation of the Syndrome of Inappropriate
Antidiuretic Hormone (SIADH)?
A. Hypernatremia
B. Dilutional hyponatremia
C. Increased serum osmolarity
D. Polyuria
Answer: B
Explanation: SIADH involves the excessive release of ADH, which causes the kidneys to
reabsorb too much water back into the bloodstream. This excess water dilutes the sodium
in the blood, leading to hyponatremia and a decrease in serum osmolarity. Clinical
symptoms often include weight gain without edema and neurological changes due to
cerebral swelling.
3. Acromegaly in adults is most commonly caused by an overproduction of which hormone?
A. Prolactin
B. Thyroid Stimulating Hormone
C. Adrenocorticotropic Hormone
D. Growth Hormone
Answer: D
,Explanation: Acromegaly occurs when the pituitary gland produces excess Growth
Hormone after the epiphyseal plates have closed. This leads to the thickening of bones and
soft tissues, particularly in the face, hands, and feet. If this hypersecretion occurred before
the closure of growth plates, it would result in gigantism.
4. Graves’ disease is characterized by which of the following pathophysiological mechanisms?
A. Autoimmune destruction of thyroid follicular cells
B. Inadequate iodine intake leading to goiter
C. Production of thyroid-stimulating immunoglobulins (TSI)
D. Pituitary adenoma secreting excessive TSH
Answer: C
Explanation: Graves’ disease is an autoimmune disorder where antibodies mimic TSH and
bind to thyroid receptors, causing the gland to overproduce thyroid hormone. This leads to
symptoms of hyperthyroidism such as heat intolerance, weight loss, and tachycardia.
Exophthalmos is a unique clinical sign often associated with this specific condition.
5. A patient with Hashimoto’s thyroiditis would most likely exhibit which laboratory profile?
A. Low TSH and high T3/T4
B. High TSH and low T3/T4
C. High TSH and high T3/T4
D. Low TSH and low T3/T4
Answer: B
Explanation: Hashimoto’s thyroiditis is an autoimmune condition where the thyroid gland
is destroyed, leading to primary hypothyroidism. Because the thyroid cannot produce
enough T3 and T4, the pituitary gland increases TSH production in a failed attempt to
stimulate the thyroid. This negative feedback loop results in the characteristic high TSH
and low hormone levels.
6. What is the most severe and life-threatening form of hypothyroidism?
A. Thyroid Storm
B. Addisonian Crisis
C. Cushing’s Crisis
D. Myxedema Coma
Answer: D
Explanation: Myxedema coma is a medical emergency characterized by extreme lethargy,
hypothermia, and respiratory depression. It represents the decompensated state of severe,
, untreated hypothyroidism. Immediate intervention is required to address the metabolic
and cardiovascular collapse associated with this state.
7. A patient with hyperparathyroidism is at high risk for which of the following
complications?
A. Hypocalcemia
B. Tetany
C. Pathological fractures and renal calculi
D. Positive Chvostek’s sign
Answer: C
Explanation: Hyperparathyroidism leads to excessive secretion of parathyroid hormone,
which pulls calcium from the bones into the blood. This results in hypercalcemia, which can
lead to the formation of kidney stones and weakened bone structure. The excess calcium in
the blood often causes symptoms like fatigue and muscle weakness.
8. Which clinical sign is indicative of hypocalcemia, often seen in hypoparathyroidism?
A. Buffalo hump
B. Exophthalmos
C. Moon face
D. Positive Trousseau’s sign
Answer: D
Explanation: Trousseau’s sign is a carpal spasm induced by inflating a blood pressure cuff,
indicating neuromuscular irritability due to low calcium. Another common sign is
Chvostek’s sign, which is a twitching of the facial muscle when the facial nerve is tapped.
These signs are critical for identifying acute electrolyte imbalances that could lead to
seizures or laryngospasm.
9. Cushing’s Syndrome is caused by a chronic excess of which hormone?
A. Aldosterone
B. Epinephrine
C. Cortisol
D. Antidiuretic Hormone
Answer: C
Explanation: Cushing’s Syndrome results from prolonged exposure to high levels of
glucocorticoids, either from endogenous production or exogenous steroid use. Common
