Exam 2: BIOS 252 / BIOS252 (Latest Update 2026/2027) Anatomy and Physiology II with Lab | Questions &
Verified Answers | Grade A | 100% Correct - Chamberlain 2026/2027 — 2026/2027 Official Exam
OBJECTIVE ASSESSMENT - EXAM
Exam 2: BIOS 252 / BIOS252 (Latest Update
2026/2027) Anatomy and Physiology II with Lab
| Questions & Verified Answers | Grade A |
100% Correct - Chamberlain 2026/2027 —
2026/2027 Official Exam
2026/2027
75 100%
QUESTIONS VERIFIED ANSWERS EDITION
TOPICS COVERED
Endocrine System Respiratory System
Cardiovascular System Digestive System
Lymphatic & Immune System
COVER PAGE - 1
, SECTION 1 | Endocrine System | Q1-Q15 | Exam 2: BIOS 252 / BIOS252 (Latest Update 2026/2027) Anatomy and
Q1 Physiology II with Lab | Questions & Verified Answers | Grade A | 100% Correct - Chamberlain 2026/2027 —
Question 1 of 75
2026/2027 Official Exam 2026/2027
A 34-year-old woman presents with galactorrhea and amenorrhea for six months. Her serum
prolactin level is 180 ng/mL (reference 5-25 ng/mL). An MRI reveals a 1.2 cm pituitary
adenoma. The anterior pituitary cell type most likely hypersecreting in this patient is derived
from which embryonic origin?
A. Rathke's pouch, an outpouching of the oral ectoderm that gives rise to adenohypophyseal cells.
B. The infundibulum, a neuroectodermal downgrowth from the diencephalon that forms the
posterior lobe.
C. The neural crest, a multipotent cell population that migrates to form the pituitary capsule.
D. The endoderm of the pharyngeal pouches, which contributes to the anterior pituitary
vasculature.
Correct Answer: A
Rationale:
The anterior pituitary (adenohypophysis) originates from Rathke's pouch, an ectodermal outpouching of the oral cavity, and
contains lactotrophs that secrete prolactin. The infundibulum (choice B) gives rise to the posterior pituitary, not the anterior
lobe, so it is the top distractor.
Q2 Question 2 of 75
A 62-year-old man with small cell lung carcinoma develops severe hyponatremia with a
serum sodium of 118 mEq/L. His urine osmolality is inappropriately elevated at 450
mOsm/kg, and his serum osmolality is low at 240 mOsm/kg. Which mechanism best explains
how the neoplastic cells produce this electrolyte disturbance?
A. The tumor secretes excessive atrial natriuretic peptide, causing renal sodium wasting and
volume depletion.
B. The tumor ectopically produces antidiuretic hormone, which acts on V2 receptors in the renal
collecting ducts to increase water reabsorption.
C. The tumor metastasizes to the posterior pituitary, directly destroying neurons that regulate thirst
and osmolality.
D. The tumor releases paraneoplastic antibodies that block aldosterone receptors in the distal
nephron.
Correct Answer: B
Rationale:
SIADH from ectopic ADH production leads to excessive free-water reabsorption via V2 receptors on collecting ducts,
producing dilutional hyponatremia with concentrated urine. Atrial natriuretic peptide (choice A) would cause hyponatremia
through natriuresis but would not produce concentrated urine, making it the top distractor.
Exam 2: BIOS 252 / BIOS252 (Latest Update 2026/2027) Anatomy and Physiology II with Lab | Questions & Verified Answers | Grade A | 100% Correct - Chamberlain 2026/2027 —
, Q3 Question 3 of 75
A 28-year-old woman in her second trimester of pregnancy has a mildly enlarged thyroid
gland. Laboratory tests reveal a TSH of 1.2 mIU/L (normal) and free T4 at the upper limit of
normal. Her urinary iodine excretion is adequate. During thyroid hormone synthesis, which
step requires the hydrogen peroxide generated by thyroid peroxidase at the apical
membrane of follicular cells?
A. Uptake of iodide from the bloodstream into the follicular cell via the sodium-iodide symporter on
the basolateral membrane.
B. Endocytosis of iodinated thyroglobulin from the follicular lumen into the follicular cell for
proteolytic cleavage.
C. Binding of T3 and T4 to thyroid-binding globulin and albumin for transport through the
bloodstream to peripheral tissues.
D. Oxidation of iodide to iodine and its subsequent organification by covalent attachment to
tyrosine residues on thyroglobulin.
Correct Answer: D
Rationale:
Thyroid peroxidase uses hydrogen peroxide to oxidize iodide to iodine and then catalyzes the organification of tyrosine
residues on thyroglobulin, the essential first steps of thyroid hormone synthesis. Iodide uptake (choice A) occurs via the
sodium-iodide symporter and does not require hydrogen peroxide, making it the top distractor.
Q4 Question 4 of 75
A 45-year-old woman was diagnosed with primary hypothyroidism eight months ago and
started on levothyroxine 50 mcg daily. She now presents with palpitations, tremor, and heat
intolerance. Her TSH is 0.08 mIU/L (low) and free T4 is elevated at 2.4 ng/dL (normal
0.8-1.8). Which feedback mechanism has failed to appropriately regulate hormone levels in
this patient?
A. Calcitonin secretion from parafollicular C cells is insufficient to counteract the elevated free T4
levels.
B. Parathyroid hormone has been suppressed by the excess T4, reducing calcium-mediated
feedback on the thyroid gland.
C. Negative feedback of elevated free T4 on the hypothalamus and anterior pituitary has been
bypassed by the exogenous levothyroxine dose.
D. Thyroid-stimulating immunoglobulins are activating the TSH receptor despite suppressed
endogenous TSH production.
Correct Answer: C
Rationale:
Exogenous levothyroxine at excessive doses raises free T4, which suppresses endogenous TSH via negative feedback on
the hypothalamus and anterior pituitary, but the patient continues taking the fixed dose regardless of TSH levels.
Thyroid-stimulating immunoglobulins (choice D) cause Graves' disease but are unrelated to exogenous thyroid hormone
replacement, making it the top distractor.
Exam 2: BIOS 252 / BIOS252 (Latest Update 2026/2027) Anatomy and Physiology II with Lab | Questions & Verified Answers | Grade A | 100% Correct - Chamberlain 2026/2027 —
, Q5 Question 5 of 75
A 45-year-old woman undergoes a total thyroidectomy for papillary thyroid carcinoma. Two
days postoperatively, she develops tingling around her mouth, muscle cramping, and a
positive Chvostek sign. Her serum calcium is 6.8 mg/dL (normal 8.5-10.5). Which feedback
mechanism has been most disrupted by the surgical procedure?
A. Removal of the parathyroid glands eliminated PTH secretion, removing its stimulatory effect on
renal 1-alpha-hydroxylase and osteoclast-mediated bone resorption.
B. Removal of the thyroid eliminated calcitonin secretion, removing its direct stimulatory effect on
osteoclast bone resorption.
C. Loss of thyroid tissue decreased local production of thyroid-stimulating immunoglobulins that
normally enhance calcium release from bone.
D. Disruption of the thyroid capsule severed the nerve supply to the parathyroid glands, preventing
them from sensing low serum calcium.
Correct Answer: A
Rationale:
The parathyroid glands are at risk during thyroidectomy; their loss eliminates PTH, which stimulates renal
1-alpha-hydroxylase (activating vitamin D) and osteoclastic bone resorption to raise serum calcium. Calcitonin deficiency
(choice B) does not cause clinically significant hypocalcemia because calcitonin has a minor and transient role in calcium
homeostasis, making it the top distractor.
Q6 Question 6 of 75
A 50-year-old man with poorly controlled hypertension presents with muscle weakness,
polyuria, and a serum potassium of 2.8 mEq/L. His plasma aldosterone-to-renin ratio is
markedly elevated, and an abdominal CT shows a 1.5 cm left adrenal nodule. Which zone of
the adrenal cortex is the primary site of the hormone responsible for this patient's findings?
A. The zona fasciculata, which produces glucocorticoids under the regulation of ACTH from the
anterior pituitary.
B. The adrenal medulla, which releases catecholamines directly into the systemic circulation under
sympathetic stimulation.
C. The zona reticularis, which secretes androgens and dehydroepiandrosterone in response to
ACTH stimulation.
D. The zona glomerulosa, which secretes mineralocorticoids in response to angiotensin II and
elevated serum potassium levels.
Correct Answer: D
Rationale:
The zona glomerulosa produces aldosterone, which acts on the distal nephron to promote sodium reabsorption and
potassium excretion, explaining this patient's hypokalemia and hypertension from a Conn's adenoma. The zona fasciculata
(choice A) produces cortisol, not aldosterone, so it is the top distractor.
Exam 2: BIOS 252 / BIOS252 (Latest Update 2026/2027) Anatomy and Physiology II with Lab | Questions & Verified Answers | Grade A | 100% Correct - Chamberlain 2026/2027 —
Verified Answers | Grade A | 100% Correct - Chamberlain 2026/2027 — 2026/2027 Official Exam
OBJECTIVE ASSESSMENT - EXAM
Exam 2: BIOS 252 / BIOS252 (Latest Update
2026/2027) Anatomy and Physiology II with Lab
| Questions & Verified Answers | Grade A |
100% Correct - Chamberlain 2026/2027 —
2026/2027 Official Exam
2026/2027
75 100%
QUESTIONS VERIFIED ANSWERS EDITION
TOPICS COVERED
Endocrine System Respiratory System
Cardiovascular System Digestive System
Lymphatic & Immune System
COVER PAGE - 1
, SECTION 1 | Endocrine System | Q1-Q15 | Exam 2: BIOS 252 / BIOS252 (Latest Update 2026/2027) Anatomy and
Q1 Physiology II with Lab | Questions & Verified Answers | Grade A | 100% Correct - Chamberlain 2026/2027 —
Question 1 of 75
2026/2027 Official Exam 2026/2027
A 34-year-old woman presents with galactorrhea and amenorrhea for six months. Her serum
prolactin level is 180 ng/mL (reference 5-25 ng/mL). An MRI reveals a 1.2 cm pituitary
adenoma. The anterior pituitary cell type most likely hypersecreting in this patient is derived
from which embryonic origin?
A. Rathke's pouch, an outpouching of the oral ectoderm that gives rise to adenohypophyseal cells.
B. The infundibulum, a neuroectodermal downgrowth from the diencephalon that forms the
posterior lobe.
C. The neural crest, a multipotent cell population that migrates to form the pituitary capsule.
D. The endoderm of the pharyngeal pouches, which contributes to the anterior pituitary
vasculature.
Correct Answer: A
Rationale:
The anterior pituitary (adenohypophysis) originates from Rathke's pouch, an ectodermal outpouching of the oral cavity, and
contains lactotrophs that secrete prolactin. The infundibulum (choice B) gives rise to the posterior pituitary, not the anterior
lobe, so it is the top distractor.
Q2 Question 2 of 75
A 62-year-old man with small cell lung carcinoma develops severe hyponatremia with a
serum sodium of 118 mEq/L. His urine osmolality is inappropriately elevated at 450
mOsm/kg, and his serum osmolality is low at 240 mOsm/kg. Which mechanism best explains
how the neoplastic cells produce this electrolyte disturbance?
A. The tumor secretes excessive atrial natriuretic peptide, causing renal sodium wasting and
volume depletion.
B. The tumor ectopically produces antidiuretic hormone, which acts on V2 receptors in the renal
collecting ducts to increase water reabsorption.
C. The tumor metastasizes to the posterior pituitary, directly destroying neurons that regulate thirst
and osmolality.
D. The tumor releases paraneoplastic antibodies that block aldosterone receptors in the distal
nephron.
Correct Answer: B
Rationale:
SIADH from ectopic ADH production leads to excessive free-water reabsorption via V2 receptors on collecting ducts,
producing dilutional hyponatremia with concentrated urine. Atrial natriuretic peptide (choice A) would cause hyponatremia
through natriuresis but would not produce concentrated urine, making it the top distractor.
Exam 2: BIOS 252 / BIOS252 (Latest Update 2026/2027) Anatomy and Physiology II with Lab | Questions & Verified Answers | Grade A | 100% Correct - Chamberlain 2026/2027 —
, Q3 Question 3 of 75
A 28-year-old woman in her second trimester of pregnancy has a mildly enlarged thyroid
gland. Laboratory tests reveal a TSH of 1.2 mIU/L (normal) and free T4 at the upper limit of
normal. Her urinary iodine excretion is adequate. During thyroid hormone synthesis, which
step requires the hydrogen peroxide generated by thyroid peroxidase at the apical
membrane of follicular cells?
A. Uptake of iodide from the bloodstream into the follicular cell via the sodium-iodide symporter on
the basolateral membrane.
B. Endocytosis of iodinated thyroglobulin from the follicular lumen into the follicular cell for
proteolytic cleavage.
C. Binding of T3 and T4 to thyroid-binding globulin and albumin for transport through the
bloodstream to peripheral tissues.
D. Oxidation of iodide to iodine and its subsequent organification by covalent attachment to
tyrosine residues on thyroglobulin.
Correct Answer: D
Rationale:
Thyroid peroxidase uses hydrogen peroxide to oxidize iodide to iodine and then catalyzes the organification of tyrosine
residues on thyroglobulin, the essential first steps of thyroid hormone synthesis. Iodide uptake (choice A) occurs via the
sodium-iodide symporter and does not require hydrogen peroxide, making it the top distractor.
Q4 Question 4 of 75
A 45-year-old woman was diagnosed with primary hypothyroidism eight months ago and
started on levothyroxine 50 mcg daily. She now presents with palpitations, tremor, and heat
intolerance. Her TSH is 0.08 mIU/L (low) and free T4 is elevated at 2.4 ng/dL (normal
0.8-1.8). Which feedback mechanism has failed to appropriately regulate hormone levels in
this patient?
A. Calcitonin secretion from parafollicular C cells is insufficient to counteract the elevated free T4
levels.
B. Parathyroid hormone has been suppressed by the excess T4, reducing calcium-mediated
feedback on the thyroid gland.
C. Negative feedback of elevated free T4 on the hypothalamus and anterior pituitary has been
bypassed by the exogenous levothyroxine dose.
D. Thyroid-stimulating immunoglobulins are activating the TSH receptor despite suppressed
endogenous TSH production.
Correct Answer: C
Rationale:
Exogenous levothyroxine at excessive doses raises free T4, which suppresses endogenous TSH via negative feedback on
the hypothalamus and anterior pituitary, but the patient continues taking the fixed dose regardless of TSH levels.
Thyroid-stimulating immunoglobulins (choice D) cause Graves' disease but are unrelated to exogenous thyroid hormone
replacement, making it the top distractor.
Exam 2: BIOS 252 / BIOS252 (Latest Update 2026/2027) Anatomy and Physiology II with Lab | Questions & Verified Answers | Grade A | 100% Correct - Chamberlain 2026/2027 —
, Q5 Question 5 of 75
A 45-year-old woman undergoes a total thyroidectomy for papillary thyroid carcinoma. Two
days postoperatively, she develops tingling around her mouth, muscle cramping, and a
positive Chvostek sign. Her serum calcium is 6.8 mg/dL (normal 8.5-10.5). Which feedback
mechanism has been most disrupted by the surgical procedure?
A. Removal of the parathyroid glands eliminated PTH secretion, removing its stimulatory effect on
renal 1-alpha-hydroxylase and osteoclast-mediated bone resorption.
B. Removal of the thyroid eliminated calcitonin secretion, removing its direct stimulatory effect on
osteoclast bone resorption.
C. Loss of thyroid tissue decreased local production of thyroid-stimulating immunoglobulins that
normally enhance calcium release from bone.
D. Disruption of the thyroid capsule severed the nerve supply to the parathyroid glands, preventing
them from sensing low serum calcium.
Correct Answer: A
Rationale:
The parathyroid glands are at risk during thyroidectomy; their loss eliminates PTH, which stimulates renal
1-alpha-hydroxylase (activating vitamin D) and osteoclastic bone resorption to raise serum calcium. Calcitonin deficiency
(choice B) does not cause clinically significant hypocalcemia because calcitonin has a minor and transient role in calcium
homeostasis, making it the top distractor.
Q6 Question 6 of 75
A 50-year-old man with poorly controlled hypertension presents with muscle weakness,
polyuria, and a serum potassium of 2.8 mEq/L. His plasma aldosterone-to-renin ratio is
markedly elevated, and an abdominal CT shows a 1.5 cm left adrenal nodule. Which zone of
the adrenal cortex is the primary site of the hormone responsible for this patient's findings?
A. The zona fasciculata, which produces glucocorticoids under the regulation of ACTH from the
anterior pituitary.
B. The adrenal medulla, which releases catecholamines directly into the systemic circulation under
sympathetic stimulation.
C. The zona reticularis, which secretes androgens and dehydroepiandrosterone in response to
ACTH stimulation.
D. The zona glomerulosa, which secretes mineralocorticoids in response to angiotensin II and
elevated serum potassium levels.
Correct Answer: D
Rationale:
The zona glomerulosa produces aldosterone, which acts on the distal nephron to promote sodium reabsorption and
potassium excretion, explaining this patient's hypokalemia and hypertension from a Conn's adenoma. The zona fasciculata
(choice A) produces cortisol, not aldosterone, so it is the top distractor.
Exam 2: BIOS 252 / BIOS252 (Latest Update 2026/2027) Anatomy and Physiology II with Lab | Questions & Verified Answers | Grade A | 100% Correct - Chamberlain 2026/2027 —
