ORIGINA L STUD Y QUESTION BA NK · COM PLETE A NSW ER KEY A + Q UA LI TY
BIOS 252 · Exam 1
Anatomy & Physiology II
with Lab
Complete Exam 1 Study Review — 50 Original Multiple-Choice Questions with Detailed Answer Rationales
CH AM B ER L AIN UN IVER SIT Y
50 200 2026/27
ORI GI NAL QUE STI ONS K E Y E D ANSW E R CHOI CE S E DI TI ON Y E AR
W H AT T H I S C OV E R S
Endocrine Principles Hypothalamus & Pituitary Thyroid, Adrenal & Pancreas
Hormone classes, receptors, feedback Anterior and posterior pituitary hormones T3/T4, PTH, cortisol, aldosterone, insulin,
loops, and regulation. and disorders. and glucagon.
Blood Composition Blood Typing & Transfusion Leukocytes & Hemostasis
Plasma, hematocrit, erythropoiesis, and ABO and Rh systems, donors, and White cell types, platelet plug formation, and
hemoglobin function. transfusion reactions. clotting cascade.
A B O UT T H IS S T UDY R E S O UR C E
This study resource contains 50 original multiple-choice review questions authored specifically for this question bank. Items
are written to align with the typical topic scope and question count of the BIOS 252 Exam 1 assessment cycle, and every
question includes a keyed correct answer plus a rationale explaining the reasoning behind it. Use the bank for timed self-
testing, targeted concept review, and final revision before test day. This material is an independent study aid created for exam
preparation; it is not an official publication of, and is not affiliated with or endorsed by, Chamberlain University.
T I MED S EL F-T ES T I N G CO N CEPT- B Y- CO N CEPT R EVI EW R AT I O N AL E- B AS ED L EAR N I N G
O R I G I N A L QU E S T I O N B A N K B I O S 2 5 2 · 5 0 QU E S T I O N S E D I TI ON 2 02 6/ 2 02 7
STUVI A STUDY REVI EW
,BIOS 252 · A&P II Exam 1 Study Review 50 Questions · With Answer Key & Rationales
SECTION 1 · QUESTIONS 1–10
Q1. A student compares the sweat glands, which release products through ducts onto a surface, with the thyroid gland,
which releases hormones directly into surrounding blood. What distinguishes the thyroid?
A. It is an exocrine gland because it releases into blood vessels
B. It is an endocrine gland, ductless and secreting hormones into the bloodstream
C. It is an autocrine gland secreting onto its own surface only
D. It is a connective tissue organ with no secretory role
Correct Answer: B
Rationale: Endocrine glands are ductless and release hormones into interstitial fluid and blood for transport to distant
targets, whereas exocrine glands use ducts to reach surfaces or cavities. This structural difference underlies the
chemical communication role of the endocrine system compared with local or external secretions.
Q2. Insulin circulates throughout the entire body, yet only certain cells respond to it. What explains this selectivity?
A. Insulin is chemically altered to activate only nearby cells
B. Blood flow delivers insulin only to responsive organs
C. Responsive cells destroy the hormone before other cells can react
D. Only insulin's target cells possess the specific membrane receptors that bind it
Correct Answer: D
Rationale: Hormones circulate widely, but a cell responds only if it expresses receptors complementary to that
hormone, defining target specificity. Receptor presence or absence explains why one hormone affects liver and muscle
but not bone. Receptor number and affinity also shape the strength of the response.
Q3. Cortisol crosses the target cell membrane and binds a receptor inside the cell, after which the complex influences
transcription. Which hormone class behaves this way?
A. Steroid hormones, which are lipid-soluble and act through intracellular receptors affecting gene expression
B. Peptide hormones such as insulin, which act through second messengers
C. Amino acid derivatives such as epinephrine, which bind surface receptors
D. Prostaglandins, which act only at ciliated membranes
Correct Answer: A
Rationale: Steroid hormones derived from cholesterol are lipid-soluble, diffuse through membranes, bind intracellular
or nuclear receptors, and alter gene transcription, producing slower but longer-lasting effects. Water-soluble peptides
and catecholamines bind surface receptors and use second-messenger cascades for rapid responses.
Original study review · Not affiliated with Chamberlain University Page 1
, BIOS 252 · A&P II Exam 1 Study Review 50 Questions · With Answer Key & Rationales
Q4. Epinephrine binds a membrane receptor on a liver cell, which activates a G protein and cyclic AMP, eventually
mobilizing glucose. What is cyclic AMP acting as here?
A. A steroid hormone crossing the membrane
B. A primary ligand that started the pathway
C. A second messenger that amplifies the signal inside the cell
D. A carrier protein in the plasma
Correct Answer: C
Rationale: Water-soluble hormones cannot cross the lipid membrane, so they rely on first messenger binding that
activates G proteins and second messengers such as cAMP, calcium, or IP3. Amplification means one hormone
molecule can generate millions of product molecules, explaining the potency of peptide hormones.
Q5. A student notices that after prolonged high hormone stimulation, a target cell displays fewer receptors and a
weaker response, while low stimulation increases receptor number. What processes are these?
A. Positive and negative feedback on the gland
B. Permissive and synergistic effects of hormones
C. Down-regulation and up-regulation of receptors, which adjust target cell sensitivity
D. Hyposecretion and hypersecretion by the gland
Correct Answer: C
Rationale: Target cells adapt their receptor numbers: chronic high hormone exposure produces down-regulation and
desensitization, while low exposure produces up-regulation and hypersensitivity. These mechanisms explain
phenomena such as type 2 diabetes insulin resistance. Hormone secretion and receptor regulation are separate control
points.
Q6. Rising blood levels of thyroid hormone inhibit the release of TSH from the anterior pituitary, and falling levels
release the brake. What control pattern is this?
A. Negative feedback, which reverses deviations from a set point and maintains homeostasis
B. Feedforward control anticipating future needs
C. Positive feedback, which amplifies the original stimulus
D. Independent regulation without any control loop
Correct Answer: A
Rationale: Negative feedback is the dominant endocrine control: the hormone's effect suppresses further secretion,
stabilizing blood levels within a narrow range. The hypothalamic-pituitary-thyroid axis demonstrates it clearly. Positive
feedback is rare in endocrinology, appearing mainly in events such as the LH surge at ovulation.
Original study review · Not affiliated with Chamberlain University Page 2
BIOS 252 · Exam 1
Anatomy & Physiology II
with Lab
Complete Exam 1 Study Review — 50 Original Multiple-Choice Questions with Detailed Answer Rationales
CH AM B ER L AIN UN IVER SIT Y
50 200 2026/27
ORI GI NAL QUE STI ONS K E Y E D ANSW E R CHOI CE S E DI TI ON Y E AR
W H AT T H I S C OV E R S
Endocrine Principles Hypothalamus & Pituitary Thyroid, Adrenal & Pancreas
Hormone classes, receptors, feedback Anterior and posterior pituitary hormones T3/T4, PTH, cortisol, aldosterone, insulin,
loops, and regulation. and disorders. and glucagon.
Blood Composition Blood Typing & Transfusion Leukocytes & Hemostasis
Plasma, hematocrit, erythropoiesis, and ABO and Rh systems, donors, and White cell types, platelet plug formation, and
hemoglobin function. transfusion reactions. clotting cascade.
A B O UT T H IS S T UDY R E S O UR C E
This study resource contains 50 original multiple-choice review questions authored specifically for this question bank. Items
are written to align with the typical topic scope and question count of the BIOS 252 Exam 1 assessment cycle, and every
question includes a keyed correct answer plus a rationale explaining the reasoning behind it. Use the bank for timed self-
testing, targeted concept review, and final revision before test day. This material is an independent study aid created for exam
preparation; it is not an official publication of, and is not affiliated with or endorsed by, Chamberlain University.
T I MED S EL F-T ES T I N G CO N CEPT- B Y- CO N CEPT R EVI EW R AT I O N AL E- B AS ED L EAR N I N G
O R I G I N A L QU E S T I O N B A N K B I O S 2 5 2 · 5 0 QU E S T I O N S E D I TI ON 2 02 6/ 2 02 7
STUVI A STUDY REVI EW
,BIOS 252 · A&P II Exam 1 Study Review 50 Questions · With Answer Key & Rationales
SECTION 1 · QUESTIONS 1–10
Q1. A student compares the sweat glands, which release products through ducts onto a surface, with the thyroid gland,
which releases hormones directly into surrounding blood. What distinguishes the thyroid?
A. It is an exocrine gland because it releases into blood vessels
B. It is an endocrine gland, ductless and secreting hormones into the bloodstream
C. It is an autocrine gland secreting onto its own surface only
D. It is a connective tissue organ with no secretory role
Correct Answer: B
Rationale: Endocrine glands are ductless and release hormones into interstitial fluid and blood for transport to distant
targets, whereas exocrine glands use ducts to reach surfaces or cavities. This structural difference underlies the
chemical communication role of the endocrine system compared with local or external secretions.
Q2. Insulin circulates throughout the entire body, yet only certain cells respond to it. What explains this selectivity?
A. Insulin is chemically altered to activate only nearby cells
B. Blood flow delivers insulin only to responsive organs
C. Responsive cells destroy the hormone before other cells can react
D. Only insulin's target cells possess the specific membrane receptors that bind it
Correct Answer: D
Rationale: Hormones circulate widely, but a cell responds only if it expresses receptors complementary to that
hormone, defining target specificity. Receptor presence or absence explains why one hormone affects liver and muscle
but not bone. Receptor number and affinity also shape the strength of the response.
Q3. Cortisol crosses the target cell membrane and binds a receptor inside the cell, after which the complex influences
transcription. Which hormone class behaves this way?
A. Steroid hormones, which are lipid-soluble and act through intracellular receptors affecting gene expression
B. Peptide hormones such as insulin, which act through second messengers
C. Amino acid derivatives such as epinephrine, which bind surface receptors
D. Prostaglandins, which act only at ciliated membranes
Correct Answer: A
Rationale: Steroid hormones derived from cholesterol are lipid-soluble, diffuse through membranes, bind intracellular
or nuclear receptors, and alter gene transcription, producing slower but longer-lasting effects. Water-soluble peptides
and catecholamines bind surface receptors and use second-messenger cascades for rapid responses.
Original study review · Not affiliated with Chamberlain University Page 1
, BIOS 252 · A&P II Exam 1 Study Review 50 Questions · With Answer Key & Rationales
Q4. Epinephrine binds a membrane receptor on a liver cell, which activates a G protein and cyclic AMP, eventually
mobilizing glucose. What is cyclic AMP acting as here?
A. A steroid hormone crossing the membrane
B. A primary ligand that started the pathway
C. A second messenger that amplifies the signal inside the cell
D. A carrier protein in the plasma
Correct Answer: C
Rationale: Water-soluble hormones cannot cross the lipid membrane, so they rely on first messenger binding that
activates G proteins and second messengers such as cAMP, calcium, or IP3. Amplification means one hormone
molecule can generate millions of product molecules, explaining the potency of peptide hormones.
Q5. A student notices that after prolonged high hormone stimulation, a target cell displays fewer receptors and a
weaker response, while low stimulation increases receptor number. What processes are these?
A. Positive and negative feedback on the gland
B. Permissive and synergistic effects of hormones
C. Down-regulation and up-regulation of receptors, which adjust target cell sensitivity
D. Hyposecretion and hypersecretion by the gland
Correct Answer: C
Rationale: Target cells adapt their receptor numbers: chronic high hormone exposure produces down-regulation and
desensitization, while low exposure produces up-regulation and hypersensitivity. These mechanisms explain
phenomena such as type 2 diabetes insulin resistance. Hormone secretion and receptor regulation are separate control
points.
Q6. Rising blood levels of thyroid hormone inhibit the release of TSH from the anterior pituitary, and falling levels
release the brake. What control pattern is this?
A. Negative feedback, which reverses deviations from a set point and maintains homeostasis
B. Feedforward control anticipating future needs
C. Positive feedback, which amplifies the original stimulus
D. Independent regulation without any control loop
Correct Answer: A
Rationale: Negative feedback is the dominant endocrine control: the hormone's effect suppresses further secretion,
stabilizing blood levels within a narrow range. The hypothalamic-pituitary-thyroid axis demonstrates it clearly. Positive
feedback is rare in endocrinology, appearing mainly in events such as the LH surge at ovulation.
Original study review · Not affiliated with Chamberlain University Page 2
