STRAIGHTERLINE A&P2 EXAM 2026/2027 | 100% Correct
Answers with Complete Solutions | Human Anatomy &
Physiology II | Clinical Correlations | Homeostasis | Pass
Guaranteed - A+ Graded
Domain 1: Endocrine System (15 Questions)
Q1: A 45-year-old patient presents with fatigue, weight gain, cold intolerance, and
bradycardia. Laboratory studies reveal elevated TSH and low free T4. Which endocrine
disorder best matches this clinical presentation?
A. Graves' disease with thyroid hormone receptor antibodies
B. Primary hypothyroidism due to thyroid gland dysfunction
C. Cushing's syndrome with excess cortisol production
D. Hyperparathyroidism with elevated calcium levels
Correct Answer: B
Rationale: The presentation of fatigue, weight gain, cold intolerance, bradycardia,
elevated TSH, and low T4 indicates primary hypothyroidism. The elevated TSH reflects
the pituitary's attempt to stimulate an underactive thyroid gland, while low T4 confirms
insufficient thyroid hormone production. Option A (Graves' disease) would present with
hyperthyroidism (weight loss, heat intolerance, tachycardia) and suppressed TSH.
Option C (Cushing's) would show weight gain with central obesity, moon face, and
hyperglycemia, not cold intolerance. Option D (hyperparathyroidism) affects calcium
,metabolism, presenting with hypercalcemia, bone pain, and kidney stones, not thyroid
dysfunction.
Q2: A patient with a pituitary adenoma presents with bitemporal hemianopsia and
hyperpigmentation. Laboratory studies show elevated ACTH and cortisol levels that do
not suppress with dexamethasone. Which hypothalamic-pituitary axis dysfunction is
present?
A. Primary adrenal insufficiency (Addison's disease)
B. Cushing's disease (ACTH-secreting pituitary adenoma)
C. Secondary adrenal insufficiency
D. Thyrotoxicosis
Correct Answer: B
Rationale: Cushing's disease is specifically caused by an ACTH-secreting pituitary
adenoma, distinguishing it from other causes of hypercortisolism. The bitemporal
hemianopsia results from the adenoma compressing the optic chiasm.
Hyperpigmentation occurs due to ACTH's melanocyte-stimulating properties. Failure to
suppress with dexamethasone confirms ACTH-dependent hypercortisolism. Option A
(Addison's) would present with low cortisol and hyperpigmentation but due to primary
adrenal failure with elevated ACTH from loss of negative feedback. Option C would
show low ACTH. Option D involves thyroid, not adrenal, dysfunction.
Q3: Which hormone is correctly paired with its mechanism of action and primary target
tissue?
A. Insulin – steroid hormone acting via intracellular receptors to increase blood glucose
,B. Glucagon – peptide hormone acting via membrane receptors to increase
glycogenolysis and gluconeogenesis
C. Cortisol – peptide hormone acting via membrane receptors to decrease protein
catabolism
D. Thyroxine (T4) – peptide hormone acting via membrane receptors to decrease
metabolic rate
Correct Answer: B
Rationale: Glucagon is a peptide hormone that binds to G-protein coupled receptors on
hepatocyte membranes, activating cAMP pathways that stimulate glycogenolysis and
gluconeogenesis to raise blood glucose. Option A is incorrect because insulin is a
peptide hormone (not steroid) that decreases blood glucose. Option C is incorrect
because cortisol is a steroid hormone (not peptide) acting via intracellular receptors
and increases protein catabolism. Option D is incorrect because thyroxine is an
amine/steroid-like hormone acting via intracellular receptors to increase metabolic rate.
Q4: A patient with Type 1 Diabetes Mellitus develops diabetic ketoacidosis (DKA).
Which hormonal imbalance primarily drives the metabolic derangements in this
condition?
A. Absolute insulin deficiency with relative glucagon excess
B. Excess insulin production with suppressed glucagon
C. Isolated growth hormone deficiency
D. Thyroid hormone excess
Correct Answer: A
, Rationale: DKA results from absolute insulin deficiency (characteristic of Type 1 DM)
combined with relative or absolute glucagon excess. Without insulin, glucose cannot
enter cells, leading to hyperglycemia and lipolysis. Glucagon stimulates hepatic
ketogenesis, producing the metabolic acidosis. The insulin:glucagon ratio is
critical—low insulin and high glucagon create the catabolic state. Option B describes
hypoglycemia, not DKA. Options C and D are unrelated to DKA pathophysiology.
Q5: Which endocrine gland is correctly matched with its embryonic origin and primary
secretory product?
A. Anterior pituitary – neural crest origin – produces oxytocin
B. Posterior pituitary – neuroectoderm (downgrowth of hypothalamus) – stores and
releases ADH and oxytocin
C. Adrenal medulla – mesodermal origin – produces aldosterone
D. Thyroid – endodermal origin – produces calcitonin only
Correct Answer: B
Rationale: The posterior pituitary (neurohypophysis) develops as a downgrowth of
neuroectoderm from the hypothalamus and stores/releases antidiuretic hormone (ADH)
and oxytocin produced in hypothalamic nuclei. Option A is incorrect because the
anterior pituitary is ectodermal (Rathke's pouch), not neural crest, and produces
different hormones (GH, ACTH, TSH, etc.)—oxytocin is posterior pituitary. Option C is
incorrect because the adrenal medulla produces catecholamines (epinephrine,
norepinephrine); aldosterone is produced by the adrenal cortex (zona glomerulosa).
Option D is incorrect because the thyroid produces T3/T4 and calcitonin.
Answers with Complete Solutions | Human Anatomy &
Physiology II | Clinical Correlations | Homeostasis | Pass
Guaranteed - A+ Graded
Domain 1: Endocrine System (15 Questions)
Q1: A 45-year-old patient presents with fatigue, weight gain, cold intolerance, and
bradycardia. Laboratory studies reveal elevated TSH and low free T4. Which endocrine
disorder best matches this clinical presentation?
A. Graves' disease with thyroid hormone receptor antibodies
B. Primary hypothyroidism due to thyroid gland dysfunction
C. Cushing's syndrome with excess cortisol production
D. Hyperparathyroidism with elevated calcium levels
Correct Answer: B
Rationale: The presentation of fatigue, weight gain, cold intolerance, bradycardia,
elevated TSH, and low T4 indicates primary hypothyroidism. The elevated TSH reflects
the pituitary's attempt to stimulate an underactive thyroid gland, while low T4 confirms
insufficient thyroid hormone production. Option A (Graves' disease) would present with
hyperthyroidism (weight loss, heat intolerance, tachycardia) and suppressed TSH.
Option C (Cushing's) would show weight gain with central obesity, moon face, and
hyperglycemia, not cold intolerance. Option D (hyperparathyroidism) affects calcium
,metabolism, presenting with hypercalcemia, bone pain, and kidney stones, not thyroid
dysfunction.
Q2: A patient with a pituitary adenoma presents with bitemporal hemianopsia and
hyperpigmentation. Laboratory studies show elevated ACTH and cortisol levels that do
not suppress with dexamethasone. Which hypothalamic-pituitary axis dysfunction is
present?
A. Primary adrenal insufficiency (Addison's disease)
B. Cushing's disease (ACTH-secreting pituitary adenoma)
C. Secondary adrenal insufficiency
D. Thyrotoxicosis
Correct Answer: B
Rationale: Cushing's disease is specifically caused by an ACTH-secreting pituitary
adenoma, distinguishing it from other causes of hypercortisolism. The bitemporal
hemianopsia results from the adenoma compressing the optic chiasm.
Hyperpigmentation occurs due to ACTH's melanocyte-stimulating properties. Failure to
suppress with dexamethasone confirms ACTH-dependent hypercortisolism. Option A
(Addison's) would present with low cortisol and hyperpigmentation but due to primary
adrenal failure with elevated ACTH from loss of negative feedback. Option C would
show low ACTH. Option D involves thyroid, not adrenal, dysfunction.
Q3: Which hormone is correctly paired with its mechanism of action and primary target
tissue?
A. Insulin – steroid hormone acting via intracellular receptors to increase blood glucose
,B. Glucagon – peptide hormone acting via membrane receptors to increase
glycogenolysis and gluconeogenesis
C. Cortisol – peptide hormone acting via membrane receptors to decrease protein
catabolism
D. Thyroxine (T4) – peptide hormone acting via membrane receptors to decrease
metabolic rate
Correct Answer: B
Rationale: Glucagon is a peptide hormone that binds to G-protein coupled receptors on
hepatocyte membranes, activating cAMP pathways that stimulate glycogenolysis and
gluconeogenesis to raise blood glucose. Option A is incorrect because insulin is a
peptide hormone (not steroid) that decreases blood glucose. Option C is incorrect
because cortisol is a steroid hormone (not peptide) acting via intracellular receptors
and increases protein catabolism. Option D is incorrect because thyroxine is an
amine/steroid-like hormone acting via intracellular receptors to increase metabolic rate.
Q4: A patient with Type 1 Diabetes Mellitus develops diabetic ketoacidosis (DKA).
Which hormonal imbalance primarily drives the metabolic derangements in this
condition?
A. Absolute insulin deficiency with relative glucagon excess
B. Excess insulin production with suppressed glucagon
C. Isolated growth hormone deficiency
D. Thyroid hormone excess
Correct Answer: A
, Rationale: DKA results from absolute insulin deficiency (characteristic of Type 1 DM)
combined with relative or absolute glucagon excess. Without insulin, glucose cannot
enter cells, leading to hyperglycemia and lipolysis. Glucagon stimulates hepatic
ketogenesis, producing the metabolic acidosis. The insulin:glucagon ratio is
critical—low insulin and high glucagon create the catabolic state. Option B describes
hypoglycemia, not DKA. Options C and D are unrelated to DKA pathophysiology.
Q5: Which endocrine gland is correctly matched with its embryonic origin and primary
secretory product?
A. Anterior pituitary – neural crest origin – produces oxytocin
B. Posterior pituitary – neuroectoderm (downgrowth of hypothalamus) – stores and
releases ADH and oxytocin
C. Adrenal medulla – mesodermal origin – produces aldosterone
D. Thyroid – endodermal origin – produces calcitonin only
Correct Answer: B
Rationale: The posterior pituitary (neurohypophysis) develops as a downgrowth of
neuroectoderm from the hypothalamus and stores/releases antidiuretic hormone (ADH)
and oxytocin produced in hypothalamic nuclei. Option A is incorrect because the
anterior pituitary is ectodermal (Rathke's pouch), not neural crest, and produces
different hormones (GH, ACTH, TSH, etc.)—oxytocin is posterior pituitary. Option C is
incorrect because the adrenal medulla produces catecholamines (epinephrine,
norepinephrine); aldosterone is produced by the adrenal cortex (zona glomerulosa).
Option D is incorrect because the thyroid produces T3/T4 and calcitonin.
