BIOS 256 Anatomy & Physiology IV Final Exam Actual 2026/2027 – Complete
Exam-Style Questions with Detailed Rationales | 100% Verified | Pass Guaranteed – A+
Graded
Section A: Endocrine System & Hormonal Regulation
Q1: A 45-year-old patient presents with fatigue, weight gain, cold intolerance, and
bradycardia. Laboratory studies reveal elevated TSH and decreased free T4. The nurse
understands that this patient's condition most likely results from dysfunction at which
level of the hypothalamic-pituitary-thyroid axis?
A. Excessive TRH secretion from the hypothalamus causing secondary hyperthyroidism
B. Primary thyroid gland failure with loss of negative feedback on the anterior pituitary
C. Pituitary adenoma secreting excess TSH leading to tertiary hyperthyroidism
D. Hypothalamic suppression due to excessive cortisol from the adrenal cortex
B. Primary thyroid gland failure with loss of negative feedback on the anterior pituitary
[CORRECT]
Correct Answer: B
Rationale: In primary hypothyroidism (e.g., Hashimoto's thyroiditis), the thyroid gland
fails to produce T3/T4, removing negative feedback on the anterior pituitary. This
causes TSH levels to rise dramatically. Option A describes incorrect pathophysiology
(elevated TRH would not cause hyperthyroidism in this context). Option C describes
secondary hyperthyroidism, which would present with elevated T4 and symptoms of
,heat intolerance/weight loss. Option D describes hypothalamic dysfunction unrelated to
the clinical picture.
Q2: A patient with Cushing's syndrome is admitted for bilateral adrenalectomy. The
nurse anticipates that postoperative management will require careful monitoring of
which electrolyte imbalance due to the sudden removal of mineralocorticoid secretion?
A. Hypernatremia and hypokalemia
B. Hyponatremia and hyperkalemia
C. Hypercalcemia and hypophosphatemia
D. Hypocalcemia and hyperphosphatemia
B. Hyponatremia and hyperkalemia [CORRECT]
Correct Answer: B
Rationale: Aldosterone (mineralocorticoid) normally promotes sodium/water retention
and potassium excretion. Sudden removal of aldosterone after adrenalectomy results in
sodium loss and potassium retention. Option A describes the effects of aldosterone
excess, not deficiency. Options C and D describe PTH/calcitonin imbalances unrelated
to adrenal mineralocorticoid function.
Q3: During a teaching session about diabetes mellitus, the nurse explains that in the
fasting state, glucagon acts primarily on which organ to maintain blood glucose through
glycogenolysis and gluconeogenesis?
,A. Skeletal muscle
B. Adipose tissue
C. Liver
D. Pancreatic beta cells
C. Liver [CORRECT]
Correct Answer: C
Rationale: Glucagon receptors are abundant on hepatocytes, stimulating glycogenolysis
and gluconeogenesis to release glucose into circulation. Skeletal muscle (A) lacks
glucagon receptors and cannot release glucose into blood (it lacks
glucose-6-phosphatase). Adipose tissue (B) responds to glucagon with lipolysis, not
glucose production. Pancreatic beta cells (D) are inhibited by glucagon via paracrine
effects from adjacent alpha cells.
Q4: A 28-year-old female presents with polyuria, polydipsia, and dilute urine (specific
gravity 1.002). Her fasting blood glucose is 92 mg/dL. The nurse recognizes these
findings are most consistent with dysfunction of which hormone?
A. Insulin
B. Antidiuretic hormone (ADH)
C. Aldosterone
D. Parathyroid hormone (PTH)
, B. Antidiuretic hormone (ADH) [CORRECT]
Correct Answer: B
Rationale: Diabetes insipidus (ADH deficiency or resistance) presents with dilute
polyuria and polydipsia despite normal blood glucose, distinguishing it from diabetes
mellitus. Insulin (A) deficiency would cause hyperglycemia. Aldosterone (C) deficiency
causes sodium wasting and hyperkalemia but not massive polyuria with dilute urine.
PTH (D) regulates calcium, not water balance.
Q5: A patient with Addison's disease asks why they need to increase corticosteroid
dosing during times of illness or stress. The nurse explains that cortisol normally
supports the stress response through which mechanism?
A. Vasoconstriction and increased peripheral vascular resistance
B. Glycogenolysis, gluconeogenesis, and anti-inflammatory effects
C. Increased calcium absorption from the gastrointestinal tract
D. Stimulation of erythropoietin production in the kidneys
B. Glycogenolysis, gluconeogenesis, and anti-inflammatory effects [CORRECT]
Correct Answer: B
Rationale: Cortisol (glucocorticoid) mobilizes energy stores via glycogenolysis and
gluconeogenesis while suppressing inflammation. Vasoconstriction (A) is primarily an
effect of catecholamines and angiotensin II. Calcium absorption (C) is mediated by
vitamin D/PTH. Erythropoietin stimulation (D) is a renal function unrelated to cortisol.
Exam-Style Questions with Detailed Rationales | 100% Verified | Pass Guaranteed – A+
Graded
Section A: Endocrine System & Hormonal Regulation
Q1: A 45-year-old patient presents with fatigue, weight gain, cold intolerance, and
bradycardia. Laboratory studies reveal elevated TSH and decreased free T4. The nurse
understands that this patient's condition most likely results from dysfunction at which
level of the hypothalamic-pituitary-thyroid axis?
A. Excessive TRH secretion from the hypothalamus causing secondary hyperthyroidism
B. Primary thyroid gland failure with loss of negative feedback on the anterior pituitary
C. Pituitary adenoma secreting excess TSH leading to tertiary hyperthyroidism
D. Hypothalamic suppression due to excessive cortisol from the adrenal cortex
B. Primary thyroid gland failure with loss of negative feedback on the anterior pituitary
[CORRECT]
Correct Answer: B
Rationale: In primary hypothyroidism (e.g., Hashimoto's thyroiditis), the thyroid gland
fails to produce T3/T4, removing negative feedback on the anterior pituitary. This
causes TSH levels to rise dramatically. Option A describes incorrect pathophysiology
(elevated TRH would not cause hyperthyroidism in this context). Option C describes
secondary hyperthyroidism, which would present with elevated T4 and symptoms of
,heat intolerance/weight loss. Option D describes hypothalamic dysfunction unrelated to
the clinical picture.
Q2: A patient with Cushing's syndrome is admitted for bilateral adrenalectomy. The
nurse anticipates that postoperative management will require careful monitoring of
which electrolyte imbalance due to the sudden removal of mineralocorticoid secretion?
A. Hypernatremia and hypokalemia
B. Hyponatremia and hyperkalemia
C. Hypercalcemia and hypophosphatemia
D. Hypocalcemia and hyperphosphatemia
B. Hyponatremia and hyperkalemia [CORRECT]
Correct Answer: B
Rationale: Aldosterone (mineralocorticoid) normally promotes sodium/water retention
and potassium excretion. Sudden removal of aldosterone after adrenalectomy results in
sodium loss and potassium retention. Option A describes the effects of aldosterone
excess, not deficiency. Options C and D describe PTH/calcitonin imbalances unrelated
to adrenal mineralocorticoid function.
Q3: During a teaching session about diabetes mellitus, the nurse explains that in the
fasting state, glucagon acts primarily on which organ to maintain blood glucose through
glycogenolysis and gluconeogenesis?
,A. Skeletal muscle
B. Adipose tissue
C. Liver
D. Pancreatic beta cells
C. Liver [CORRECT]
Correct Answer: C
Rationale: Glucagon receptors are abundant on hepatocytes, stimulating glycogenolysis
and gluconeogenesis to release glucose into circulation. Skeletal muscle (A) lacks
glucagon receptors and cannot release glucose into blood (it lacks
glucose-6-phosphatase). Adipose tissue (B) responds to glucagon with lipolysis, not
glucose production. Pancreatic beta cells (D) are inhibited by glucagon via paracrine
effects from adjacent alpha cells.
Q4: A 28-year-old female presents with polyuria, polydipsia, and dilute urine (specific
gravity 1.002). Her fasting blood glucose is 92 mg/dL. The nurse recognizes these
findings are most consistent with dysfunction of which hormone?
A. Insulin
B. Antidiuretic hormone (ADH)
C. Aldosterone
D. Parathyroid hormone (PTH)
, B. Antidiuretic hormone (ADH) [CORRECT]
Correct Answer: B
Rationale: Diabetes insipidus (ADH deficiency or resistance) presents with dilute
polyuria and polydipsia despite normal blood glucose, distinguishing it from diabetes
mellitus. Insulin (A) deficiency would cause hyperglycemia. Aldosterone (C) deficiency
causes sodium wasting and hyperkalemia but not massive polyuria with dilute urine.
PTH (D) regulates calcium, not water balance.
Q5: A patient with Addison's disease asks why they need to increase corticosteroid
dosing during times of illness or stress. The nurse explains that cortisol normally
supports the stress response through which mechanism?
A. Vasoconstriction and increased peripheral vascular resistance
B. Glycogenolysis, gluconeogenesis, and anti-inflammatory effects
C. Increased calcium absorption from the gastrointestinal tract
D. Stimulation of erythropoietin production in the kidneys
B. Glycogenolysis, gluconeogenesis, and anti-inflammatory effects [CORRECT]
Correct Answer: B
Rationale: Cortisol (glucocorticoid) mobilizes energy stores via glycogenolysis and
gluconeogenesis while suppressing inflammation. Vasoconstriction (A) is primarily an
effect of catecholamines and angiotensin II. Calcium absorption (C) is mediated by
vitamin D/PTH. Erythropoietin stimulation (D) is a renal function unrelated to cortisol.
