BIOLOGY 2402 Anatomy and Physiology 2 Comprehensive
Final Exam Actual Exam 2026/2027 – Complete 100
Questions with Detailed Rationales | 100% Verified | Pass
Guaranteed – A+ Graded
SECTION A: Endocrine System – Glands, Hormones & Regulation
(Q1–Q12)
Q1: A patient presents with polyuria (4–5 L urine/day), polydipsia, and a urine specific
gravity of 1.002. Plasma ADH levels are undetectable. Which diagnosis and treatment
are most appropriate?
A. Diabetes mellitus type 2; insulin therapy
B. Syndrome of inappropriate ADH; fluid restriction
C. Diabetes insipidus; desmopressin (synthetic ADH) replacement [CORRECT]
D. Hyperaldosteronism; spironolactone
Correct Answer: C
Rationale: Absent ADH with dilute polyuria and extreme thirst defines diabetes insipidus,
requiring ADH replacement. Diabetes mellitus causes glucosuria with elevated specific
gravity, SIADH produces concentrated urine with fluid overload, and aldosterone excess
causes sodium/water retention.
Q2: Which mechanism of action describes peptide hormones such as insulin and
growth hormone?
A. Diffusing through the plasma membrane to bind intracellular nuclear receptors
B. Binding to cell-surface receptors and activating second messengers such as cAMP
[CORRECT]
C. Binding directly to DNA without a receptor intermediate
D. Dissolving in the lipid bilayer and permanently inactivating ion channels
Correct Answer: B
Rationale: Water-soluble peptide hormones cannot cross the lipid membrane, so they
bind surface receptors and signal through second messengers (e.g., cAMP, IP3). Steroid
hormones, not peptides, use intracellular nuclear receptor mechanisms.
,Q3: A patient complains of heat intolerance, weight loss despite increased appetite,
tachycardia, and exophthalmos. Serum TSH is 0.01 mIU/L (low), and free T4 is elevated.
The most likely diagnosis and mechanism are:
A. Primary hypothyroidism with low thyroid output
B. Secondary hyperthyroidism with excess TSH secretion
C. Graves' disease — autoimmune thyroid stimulation causing primary hyperthyroidism
with suppressed TSH from negative feedback [CORRECT]
D. Pituitary adenoma secreting thyroid-releasing hormone
Correct Answer: C
Rationale: Elevated T4 with suppressed TSH indicates primary thyroid overactivity;
exophthalmos and heat intolerance are hallmarks of Graves' disease. Secondary
hyperthyroidism would show elevated TSH, and hypothyroidism would present with the
opposite symptoms.
Q4: A patient has a serum calcium of 7.0 mg/dL (low) and presents with carpopedal
spasm and tingling around the mouth. Which hormone deficiency explains this
presentation?
A. Calcitonin
B. Cortisol
C. Aldosterone
D. Parathyroid hormone (PTH) [CORRECT]
Correct Answer: D
Rationale: PTH raises serum calcium through bone resorption, renal reabsorption, and
vitamin D activation; its deficiency causes hypocalcemia with neuromuscular
excitability. Calcitonin lowers calcium, and cortisol/aldosterone do not regulate calcium
homeostasis.
Q5: A patient presents with central obesity, a rounded "moon face," proximal muscle
weakness, hyperglycemia, and purple striae on the abdomen. Which hormone excess
and source are most consistent?
A. Aldosterone from the adrenal zona glomerulosa
B. Cortisol from the adrenal zona fasciculata [CORRECT]
C. Androgens from the adrenal zona reticularis
D. Epinephrine from the adrenal medulla
Correct Answer: B
Rationale: Hypercortisolism (Cushing's syndrome) produces glucose elevation, central
fat redistribution, muscle wasting, and skin changes — cortisol is produced by the
middle cortical layer. Aldosterone causes hypertension and hypokalemia, and medullary
catecholamines cause episodic hypertensive crises.
,Q6: A patient injected with insulin before a meal experiences a rapid drop in blood
glucose, and the pancreas subsequently releases glucagon from alpha cells. The
glucagon's primary target organ and effect are:
A. Skeletal muscle; stimulate protein synthesis
B. Adipose tissue; promote lipogenesis
C. Kidney; increase sodium reabsorption
D. Liver; stimulate glycogenolysis and gluconeogenesis to raise blood glucose
[CORRECT]
Correct Answer: D
Rationale: Glucagon acts primarily on hepatocytes to break down glycogen and
generate new glucose, restoring euglycemia after insulin overshoot. Muscle protein
synthesis is insulin-mediated, and lipogenesis is an insulin (not glucagon) action.
Q7: A patient's blood glucose rises after a meal. Pancreatic beta cells detect the
increase and secrete insulin, which lowers blood glucose, and insulin secretion
subsequently decreases. This sequence illustrates:
A. Positive feedback amplification
B. Feed-forward activation
C. Neural override of endocrine function
D. Negative feedback regulation of hormone secretion [CORRECT]
Correct Answer: D
Rationale: Negative feedback is defined by the product (or effect) of a process reducing
further output of that process — rising glucose triggers insulin, which lowers glucose
and ends insulin release. Positive feedback would amplify the initial change, and no
neural mechanism is described.
Q8: A patient's ACTH level is chronically elevated, and bilateral adrenal hypertrophy is
noted on imaging. Which statement is most accurate?
A. ACTH directly stores cortisol in the adrenal medulla
B. ACTH stimulates cortisol synthesis from the adrenal cortex, and chronic elevation
produces cortical hyperplasia [CORRECT]
C. ACTH regulates mineralocorticoid release independently of cortisol
D. ACTH is secreted by the posterior pituitary
Correct Answer: B
Rationale: ACTH from the anterior pituitary trophically stimulates the zona fasciculata to
produce cortisol; chronic excess causes adrenal enlargement. ACTH is not stored as
cortisol, its primary effect is glucocorticoid regulation, and it originates from the
anterior — not posterior — pituitary.
, Q9: A tall adolescent boy presents with extreme height (7'1"), enlarged hands and feet,
and jaw protrusion. His growth plates are still open. The most likely endocrine diagnosis
and gland responsible are:
A. Acromegaly from the thyroid gland
B. Gigantism from a growth hormone–secreting anterior pituitary adenoma [CORRECT]
C. Cretinism from the adrenal gland
D. Addison's disease from the pancreas
Correct Answer: B
Rationale: Growth hormone excess before epiphyseal closure causes proportional
gigantism from a pituitary adenoma. Acromegaly occurs only after plates have closed
(producing facial/limb changes without height gain), and cretinism and Addison's
disease do not cause gigantism.
Q10: A patient with a diagnosed anterior pituitary tumor secretes excessive TSH. Which
downstream effect would be expected?
A. Decreased thyroid hormone production
B. Increased thyroid hormone production with goiter formation [CORRECT]
C. Decreased thyroid gland size
D. No change in thyroid function
Correct Answer: B
Rationale: TSH is trophic to the thyroid, stimulating both hormone synthesis and
glandular growth (goiter). Anatomical atrophy and functional decline contradict the
trophic action of TSH.
Q11: Which statement correctly describes the permissive effect of hormones?
A. One hormone opposes the action of another
B. Two hormones produce an effect greater than either alone
C. One hormone requires another to be present to exert its full effect — e.g.,
epinephrine's lipolytic effect requires baseline thyroid hormone [CORRECT]
D. A hormone produces the same effect through two different receptors
Correct Answer: C
Rationale: Permissiveness means one hormone upregulates the target cell's
responsiveness to another; thyroid hormones permit full catecholamine action.
Antagonism describes opposing effects, synergism describes amplified combined
effects, and identical dual-receptor action is not permissiveness.
Q12: A patient with chronic hypercortisolism develops impaired wound healing, skin
fragility, and reduced inflammatory response. The best explanation is:
A. Cortisol increases collagen cross-linking and accelerates fibroblast proliferation
B. Cortisol enhances neutrophil migration to wound sites
Final Exam Actual Exam 2026/2027 – Complete 100
Questions with Detailed Rationales | 100% Verified | Pass
Guaranteed – A+ Graded
SECTION A: Endocrine System – Glands, Hormones & Regulation
(Q1–Q12)
Q1: A patient presents with polyuria (4–5 L urine/day), polydipsia, and a urine specific
gravity of 1.002. Plasma ADH levels are undetectable. Which diagnosis and treatment
are most appropriate?
A. Diabetes mellitus type 2; insulin therapy
B. Syndrome of inappropriate ADH; fluid restriction
C. Diabetes insipidus; desmopressin (synthetic ADH) replacement [CORRECT]
D. Hyperaldosteronism; spironolactone
Correct Answer: C
Rationale: Absent ADH with dilute polyuria and extreme thirst defines diabetes insipidus,
requiring ADH replacement. Diabetes mellitus causes glucosuria with elevated specific
gravity, SIADH produces concentrated urine with fluid overload, and aldosterone excess
causes sodium/water retention.
Q2: Which mechanism of action describes peptide hormones such as insulin and
growth hormone?
A. Diffusing through the plasma membrane to bind intracellular nuclear receptors
B. Binding to cell-surface receptors and activating second messengers such as cAMP
[CORRECT]
C. Binding directly to DNA without a receptor intermediate
D. Dissolving in the lipid bilayer and permanently inactivating ion channels
Correct Answer: B
Rationale: Water-soluble peptide hormones cannot cross the lipid membrane, so they
bind surface receptors and signal through second messengers (e.g., cAMP, IP3). Steroid
hormones, not peptides, use intracellular nuclear receptor mechanisms.
,Q3: A patient complains of heat intolerance, weight loss despite increased appetite,
tachycardia, and exophthalmos. Serum TSH is 0.01 mIU/L (low), and free T4 is elevated.
The most likely diagnosis and mechanism are:
A. Primary hypothyroidism with low thyroid output
B. Secondary hyperthyroidism with excess TSH secretion
C. Graves' disease — autoimmune thyroid stimulation causing primary hyperthyroidism
with suppressed TSH from negative feedback [CORRECT]
D. Pituitary adenoma secreting thyroid-releasing hormone
Correct Answer: C
Rationale: Elevated T4 with suppressed TSH indicates primary thyroid overactivity;
exophthalmos and heat intolerance are hallmarks of Graves' disease. Secondary
hyperthyroidism would show elevated TSH, and hypothyroidism would present with the
opposite symptoms.
Q4: A patient has a serum calcium of 7.0 mg/dL (low) and presents with carpopedal
spasm and tingling around the mouth. Which hormone deficiency explains this
presentation?
A. Calcitonin
B. Cortisol
C. Aldosterone
D. Parathyroid hormone (PTH) [CORRECT]
Correct Answer: D
Rationale: PTH raises serum calcium through bone resorption, renal reabsorption, and
vitamin D activation; its deficiency causes hypocalcemia with neuromuscular
excitability. Calcitonin lowers calcium, and cortisol/aldosterone do not regulate calcium
homeostasis.
Q5: A patient presents with central obesity, a rounded "moon face," proximal muscle
weakness, hyperglycemia, and purple striae on the abdomen. Which hormone excess
and source are most consistent?
A. Aldosterone from the adrenal zona glomerulosa
B. Cortisol from the adrenal zona fasciculata [CORRECT]
C. Androgens from the adrenal zona reticularis
D. Epinephrine from the adrenal medulla
Correct Answer: B
Rationale: Hypercortisolism (Cushing's syndrome) produces glucose elevation, central
fat redistribution, muscle wasting, and skin changes — cortisol is produced by the
middle cortical layer. Aldosterone causes hypertension and hypokalemia, and medullary
catecholamines cause episodic hypertensive crises.
,Q6: A patient injected with insulin before a meal experiences a rapid drop in blood
glucose, and the pancreas subsequently releases glucagon from alpha cells. The
glucagon's primary target organ and effect are:
A. Skeletal muscle; stimulate protein synthesis
B. Adipose tissue; promote lipogenesis
C. Kidney; increase sodium reabsorption
D. Liver; stimulate glycogenolysis and gluconeogenesis to raise blood glucose
[CORRECT]
Correct Answer: D
Rationale: Glucagon acts primarily on hepatocytes to break down glycogen and
generate new glucose, restoring euglycemia after insulin overshoot. Muscle protein
synthesis is insulin-mediated, and lipogenesis is an insulin (not glucagon) action.
Q7: A patient's blood glucose rises after a meal. Pancreatic beta cells detect the
increase and secrete insulin, which lowers blood glucose, and insulin secretion
subsequently decreases. This sequence illustrates:
A. Positive feedback amplification
B. Feed-forward activation
C. Neural override of endocrine function
D. Negative feedback regulation of hormone secretion [CORRECT]
Correct Answer: D
Rationale: Negative feedback is defined by the product (or effect) of a process reducing
further output of that process — rising glucose triggers insulin, which lowers glucose
and ends insulin release. Positive feedback would amplify the initial change, and no
neural mechanism is described.
Q8: A patient's ACTH level is chronically elevated, and bilateral adrenal hypertrophy is
noted on imaging. Which statement is most accurate?
A. ACTH directly stores cortisol in the adrenal medulla
B. ACTH stimulates cortisol synthesis from the adrenal cortex, and chronic elevation
produces cortical hyperplasia [CORRECT]
C. ACTH regulates mineralocorticoid release independently of cortisol
D. ACTH is secreted by the posterior pituitary
Correct Answer: B
Rationale: ACTH from the anterior pituitary trophically stimulates the zona fasciculata to
produce cortisol; chronic excess causes adrenal enlargement. ACTH is not stored as
cortisol, its primary effect is glucocorticoid regulation, and it originates from the
anterior — not posterior — pituitary.
, Q9: A tall adolescent boy presents with extreme height (7'1"), enlarged hands and feet,
and jaw protrusion. His growth plates are still open. The most likely endocrine diagnosis
and gland responsible are:
A. Acromegaly from the thyroid gland
B. Gigantism from a growth hormone–secreting anterior pituitary adenoma [CORRECT]
C. Cretinism from the adrenal gland
D. Addison's disease from the pancreas
Correct Answer: B
Rationale: Growth hormone excess before epiphyseal closure causes proportional
gigantism from a pituitary adenoma. Acromegaly occurs only after plates have closed
(producing facial/limb changes without height gain), and cretinism and Addison's
disease do not cause gigantism.
Q10: A patient with a diagnosed anterior pituitary tumor secretes excessive TSH. Which
downstream effect would be expected?
A. Decreased thyroid hormone production
B. Increased thyroid hormone production with goiter formation [CORRECT]
C. Decreased thyroid gland size
D. No change in thyroid function
Correct Answer: B
Rationale: TSH is trophic to the thyroid, stimulating both hormone synthesis and
glandular growth (goiter). Anatomical atrophy and functional decline contradict the
trophic action of TSH.
Q11: Which statement correctly describes the permissive effect of hormones?
A. One hormone opposes the action of another
B. Two hormones produce an effect greater than either alone
C. One hormone requires another to be present to exert its full effect — e.g.,
epinephrine's lipolytic effect requires baseline thyroid hormone [CORRECT]
D. A hormone produces the same effect through two different receptors
Correct Answer: C
Rationale: Permissiveness means one hormone upregulates the target cell's
responsiveness to another; thyroid hormones permit full catecholamine action.
Antagonism describes opposing effects, synergism describes amplified combined
effects, and identical dual-receptor action is not permissiveness.
Q12: A patient with chronic hypercortisolism develops impaired wound healing, skin
fragility, and reduced inflammatory response. The best explanation is:
A. Cortisol increases collagen cross-linking and accelerates fibroblast proliferation
B. Cortisol enhances neutrophil migration to wound sites
