NSG 5003 WEEK 8 KNOWLEDGE CHECK
- ADVANCED PATHOPHYSIOLOGY OF
THE ENDOCRINE SYSTEM
QUESTRIONS WITH COMPLETE
SOLUTION GUARANTEED SUCCESS.
1. A patient is diagnosed with a pituitary adenoma that secretes excessive Growth Hormone
(GH) after the epiphyseal plates have closed. Which clinical manifestation is most likely?
A. Acromegaly
B. Gigantism
C. Dwarfism
D. Cretinism
Answer: A
Conceptual Explanation: Acromegaly occurs in adults after epiphyseal closure,
characterized by enlargement of bones in the face, hands, and feet. Gigantism occurs if the
excess GH is present before epiphyseal closure.
2. Which mechanism describes how water-soluble hormones, such as insulin, exert their
effects on target cells?
A. Crossing the lipid bilayer to bind to nuclear receptors
,B. Binding to transport proteins in the cytoplasm
C. Directly modifying DNA transcription without a receptor
D. Binding to cell surface receptors and activating second messengers
Answer: D
Conceptual Explanation: Water-soluble hormones cannot cross the cell membrane and
must bind to extracellular receptors to trigger intracellular signaling cascades like cAMP or
tyrosine kinase pathways.
3. In a patient with SIADH, what is the primary electrolyte abnormality expected due to
excessive water retention?
A. Hypernatremia
B. Hypokalemia
C. Hyponatremia
D. Hypercalcemia
Answer: C
Conceptual Explanation: Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
results in dilutional hyponatremia because the body retains water, which dilutes the serum
sodium concentration.
4. Which laboratory finding is most characteristic of Central Diabetes Insipidus?
A. Low urine osmolality and high serum osmolality
, B. Low urine osmolality and low serum osmolality
C. High urine osmolality and high serum osmolality
D. High urine specific gravity
Answer: A
Conceptual Explanation: Diabetes Insipidus involves a lack of ADH, leading to the inability
to concentrate urine (low urine osmolality) and subsequent dehydration (high serum
osmolality).
5. What is the primary pathophysiology behind Graves’ disease?
A. Autoimmune destruction of the thyroid gland
B. Iodine deficiency leading to goiter
C. Thyroid-stimulating immunoglobulins (TSI) mimicking TSH
D. Pituitary overproduction of TSH
Answer: C
Conceptual Explanation: Graves’ disease is an autoimmune disorder where Type II
hypersensitivity involves antibodies (TSI) that bind to and activate the TSH receptor,
causing hyperthyroidism.
6. A patient presents with a TSH level of 12.0 mU/L (High) and a free T4 level of 0.5 ng/dL
(Low). This pattern suggests:
A. Primary Hyperthyroidism
- ADVANCED PATHOPHYSIOLOGY OF
THE ENDOCRINE SYSTEM
QUESTRIONS WITH COMPLETE
SOLUTION GUARANTEED SUCCESS.
1. A patient is diagnosed with a pituitary adenoma that secretes excessive Growth Hormone
(GH) after the epiphyseal plates have closed. Which clinical manifestation is most likely?
A. Acromegaly
B. Gigantism
C. Dwarfism
D. Cretinism
Answer: A
Conceptual Explanation: Acromegaly occurs in adults after epiphyseal closure,
characterized by enlargement of bones in the face, hands, and feet. Gigantism occurs if the
excess GH is present before epiphyseal closure.
2. Which mechanism describes how water-soluble hormones, such as insulin, exert their
effects on target cells?
A. Crossing the lipid bilayer to bind to nuclear receptors
,B. Binding to transport proteins in the cytoplasm
C. Directly modifying DNA transcription without a receptor
D. Binding to cell surface receptors and activating second messengers
Answer: D
Conceptual Explanation: Water-soluble hormones cannot cross the cell membrane and
must bind to extracellular receptors to trigger intracellular signaling cascades like cAMP or
tyrosine kinase pathways.
3. In a patient with SIADH, what is the primary electrolyte abnormality expected due to
excessive water retention?
A. Hypernatremia
B. Hypokalemia
C. Hyponatremia
D. Hypercalcemia
Answer: C
Conceptual Explanation: Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
results in dilutional hyponatremia because the body retains water, which dilutes the serum
sodium concentration.
4. Which laboratory finding is most characteristic of Central Diabetes Insipidus?
A. Low urine osmolality and high serum osmolality
, B. Low urine osmolality and low serum osmolality
C. High urine osmolality and high serum osmolality
D. High urine specific gravity
Answer: A
Conceptual Explanation: Diabetes Insipidus involves a lack of ADH, leading to the inability
to concentrate urine (low urine osmolality) and subsequent dehydration (high serum
osmolality).
5. What is the primary pathophysiology behind Graves’ disease?
A. Autoimmune destruction of the thyroid gland
B. Iodine deficiency leading to goiter
C. Thyroid-stimulating immunoglobulins (TSI) mimicking TSH
D. Pituitary overproduction of TSH
Answer: C
Conceptual Explanation: Graves’ disease is an autoimmune disorder where Type II
hypersensitivity involves antibodies (TSI) that bind to and activate the TSH receptor,
causing hyperthyroidism.
6. A patient presents with a TSH level of 12.0 mU/L (High) and a free T4 level of 0.5 ng/dL
(Low). This pattern suggests:
A. Primary Hyperthyroidism
