ANATOMY & PHYSIOLOGY II STRAIGHTERLINE 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 a
goiter. Laboratory studies show elevated TSH and decreased free T4. Which endocrine
disorder best matches this clinical presentation?
A. Graves' disease (hyperthyroidism)
B. Hashimoto's thyroiditis (primary hypothyroidism) [CORRECT]
C. Cushing's syndrome
D. Addison's disease
Correct Answer: B
Rationale: The clinical presentation of fatigue, weight gain, cold intolerance, and goiter
with elevated TSH and decreased T4 indicates primary hypothyroidism. Hashimoto's
thyroiditis is an autoimmune disorder causing thyroid destruction, leading to decreased
thyroid hormone production. The elevated TSH reflects the pituitary's attempt to
stimulate the underactive thyroid (negative feedback). Graves' disease (A) would show
hyperthyroidism (weight loss, heat intolerance, decreased TSH, elevated T4). Cushing's
syndrome (C) involves cortisol excess (weight gain in trunk, moon face, buffalo hump).
Addison's disease (D) is adrenal insufficiency (fatigue, hypotension, hyperpigmentation,
hyponatremia, hyperkalemia).
,Q2: A patient with a pituitary adenoma presents with gigantism (if adolescent) or
acromegaly (if adult). Which hormone is being hypersecreted by this tumor?
A. Thyroid-stimulating hormone (TSH)
B. Adrenocorticotropic hormone (ACTH)
C. Growth hormone (GH) [CORRECT]
D. Prolactin
Correct Answer: C
Rationale: Growth hormone (GH) hypersecretion from a pituitary adenoma causes
gigantism in children (before epiphyseal plate closure) or acromegaly in adults (after
epiphyseal closure, causing bone thickening and organomegaly). GH stimulates IGF-1
production by the liver, promoting growth. TSH hypersecretion (A) causes
hyperthyroidism. ACTH hypersecretion (B) causes Cushing's disease. Prolactin
hypersecretion (D) causes galactorrhea and amenorrhea/infertility.
Q3: Which mechanism correctly describes how steroid hormones exert their cellular
effects?
A. Binding to cell surface receptors and activating second messengers (cAMP, IP3)
B. Diffusing through plasma membrane and binding to intracellular receptors that
regulate gene transcription [CORRECT]
C. Binding to G-protein coupled receptors and opening ion channels
D. Activating tyrosine kinase receptors on the cell surface
,Correct Answer: B
Rationale: Steroid hormones (cortisol, aldosterone, estrogen, testosterone,
progesterone) are lipid-soluble and diffuse through the plasma membrane to bind
intracellular receptors (cytoplasmic or nuclear). The hormone-receptor complex acts as
a transcription factor, binding to DNA and altering gene expression. This genomic
mechanism explains the slow onset (hours) but prolonged duration of steroid hormone
effects. Peptide hormones (A, C, D) use cell surface receptors and second messengers
for rapid, short-duration effects.
Q4: A patient with type 1 diabetes mellitus develops diabetic ketoacidosis (DKA). Which
hormonal deficiency and metabolic derangement explain this condition?
A. Insulin deficiency leading to increased lipolysis, ketogenesis, and hyperglycemia
[CORRECT]
B. Glucagon deficiency leading to hypoglycemia and fat storage
C. Cortisol excess leading to gluconeogenesis and glycogenolysis
D. Growth hormone deficiency leading to hypoglycemia and decreased lipolysis
Correct Answer: A
Rationale: DKA results from absolute insulin deficiency (type 1 diabetes). Without
insulin, cells cannot take up glucose (causing hyperglycemia), and the body shifts to fat
metabolism. Increased lipolysis releases fatty acids, which the liver converts to ketone
bodies (acetoacetate, beta-hydroxybutyrate) for energy, causing metabolic acidosis.
Glucagon (B) is actually elevated in DKA, contributing to hyperglycemia. Cortisol excess
(C) causes hyperglycemia but not ketosis. GH deficiency (D) is unrelated to DKA
pathophysiology.
, Q5: Which structure serves as the master regulator of the endocrine system by
controlling the release of hormones from the anterior and posterior pituitary?
A. Pineal gland
B. Hypothalamus [CORRECT]
C. Thalamus
D. Medulla oblongata
Correct Answer: B
Rationale: The hypothalamus regulates the endocrine system through: (1)
hypothalamic-releasing and inhibiting hormones controlling the anterior pituitary via the
hypophyseal portal system, and (2) producing ADH and oxytocin transported to the
posterior pituitary for storage/release. The hypothalamus integrates neural and
endocrine signals to maintain homeostasis. The pineal gland (A) produces melatonin
for circadian rhythm. The thalamus (C) is a sensory relay station. The medulla (D)
contains autonomic centers but doesn't regulate pituitary function.
Q6: A patient presents with hyperpigmentation of skin creases, hypotension,
hyponatremia, and hyperkalemia. Which endocrine disorder explains these findings?
A. Cushing's syndrome
B. Addison's disease (primary adrenal insufficiency) [CORRECT]
C. Hyperaldosteronism
D. Pheochromocytoma
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 a
goiter. Laboratory studies show elevated TSH and decreased free T4. Which endocrine
disorder best matches this clinical presentation?
A. Graves' disease (hyperthyroidism)
B. Hashimoto's thyroiditis (primary hypothyroidism) [CORRECT]
C. Cushing's syndrome
D. Addison's disease
Correct Answer: B
Rationale: The clinical presentation of fatigue, weight gain, cold intolerance, and goiter
with elevated TSH and decreased T4 indicates primary hypothyroidism. Hashimoto's
thyroiditis is an autoimmune disorder causing thyroid destruction, leading to decreased
thyroid hormone production. The elevated TSH reflects the pituitary's attempt to
stimulate the underactive thyroid (negative feedback). Graves' disease (A) would show
hyperthyroidism (weight loss, heat intolerance, decreased TSH, elevated T4). Cushing's
syndrome (C) involves cortisol excess (weight gain in trunk, moon face, buffalo hump).
Addison's disease (D) is adrenal insufficiency (fatigue, hypotension, hyperpigmentation,
hyponatremia, hyperkalemia).
,Q2: A patient with a pituitary adenoma presents with gigantism (if adolescent) or
acromegaly (if adult). Which hormone is being hypersecreted by this tumor?
A. Thyroid-stimulating hormone (TSH)
B. Adrenocorticotropic hormone (ACTH)
C. Growth hormone (GH) [CORRECT]
D. Prolactin
Correct Answer: C
Rationale: Growth hormone (GH) hypersecretion from a pituitary adenoma causes
gigantism in children (before epiphyseal plate closure) or acromegaly in adults (after
epiphyseal closure, causing bone thickening and organomegaly). GH stimulates IGF-1
production by the liver, promoting growth. TSH hypersecretion (A) causes
hyperthyroidism. ACTH hypersecretion (B) causes Cushing's disease. Prolactin
hypersecretion (D) causes galactorrhea and amenorrhea/infertility.
Q3: Which mechanism correctly describes how steroid hormones exert their cellular
effects?
A. Binding to cell surface receptors and activating second messengers (cAMP, IP3)
B. Diffusing through plasma membrane and binding to intracellular receptors that
regulate gene transcription [CORRECT]
C. Binding to G-protein coupled receptors and opening ion channels
D. Activating tyrosine kinase receptors on the cell surface
,Correct Answer: B
Rationale: Steroid hormones (cortisol, aldosterone, estrogen, testosterone,
progesterone) are lipid-soluble and diffuse through the plasma membrane to bind
intracellular receptors (cytoplasmic or nuclear). The hormone-receptor complex acts as
a transcription factor, binding to DNA and altering gene expression. This genomic
mechanism explains the slow onset (hours) but prolonged duration of steroid hormone
effects. Peptide hormones (A, C, D) use cell surface receptors and second messengers
for rapid, short-duration effects.
Q4: A patient with type 1 diabetes mellitus develops diabetic ketoacidosis (DKA). Which
hormonal deficiency and metabolic derangement explain this condition?
A. Insulin deficiency leading to increased lipolysis, ketogenesis, and hyperglycemia
[CORRECT]
B. Glucagon deficiency leading to hypoglycemia and fat storage
C. Cortisol excess leading to gluconeogenesis and glycogenolysis
D. Growth hormone deficiency leading to hypoglycemia and decreased lipolysis
Correct Answer: A
Rationale: DKA results from absolute insulin deficiency (type 1 diabetes). Without
insulin, cells cannot take up glucose (causing hyperglycemia), and the body shifts to fat
metabolism. Increased lipolysis releases fatty acids, which the liver converts to ketone
bodies (acetoacetate, beta-hydroxybutyrate) for energy, causing metabolic acidosis.
Glucagon (B) is actually elevated in DKA, contributing to hyperglycemia. Cortisol excess
(C) causes hyperglycemia but not ketosis. GH deficiency (D) is unrelated to DKA
pathophysiology.
, Q5: Which structure serves as the master regulator of the endocrine system by
controlling the release of hormones from the anterior and posterior pituitary?
A. Pineal gland
B. Hypothalamus [CORRECT]
C. Thalamus
D. Medulla oblongata
Correct Answer: B
Rationale: The hypothalamus regulates the endocrine system through: (1)
hypothalamic-releasing and inhibiting hormones controlling the anterior pituitary via the
hypophyseal portal system, and (2) producing ADH and oxytocin transported to the
posterior pituitary for storage/release. The hypothalamus integrates neural and
endocrine signals to maintain homeostasis. The pineal gland (A) produces melatonin
for circadian rhythm. The thalamus (C) is a sensory relay station. The medulla (D)
contains autonomic centers but doesn't regulate pituitary function.
Q6: A patient presents with hyperpigmentation of skin creases, hypotension,
hyponatremia, and hyperkalemia. Which endocrine disorder explains these findings?
A. Cushing's syndrome
B. Addison's disease (primary adrenal insufficiency) [CORRECT]
C. Hyperaldosteronism
D. Pheochromocytoma
