BIOL 251 FINAL EXAM AND STUDY GUIDE NEWEST
2026 TEST BANK WITH 350 QUESTIONS AND
CORRECT ANSWERS
1. A patient has a tumor that secretes excessive Parathyroid Hormone (PTH).
Which lab result would you expect?
A) Hypercalcemia and hypophosphatemia
B) Hypocalcemia and hyperphosphatemia
C) Hypercalcemia and hyperphosphatemia
D) Hypocalcemia and hypophosphatemia
Answer: A (PTH increases blood Ca²⁺ by stimulating osteoclasts, increasing
intestinal absorption, and decreasing renal excretion. Simultaneously, it promotes
renal excretion of phosphate, leading to low serum phosphate.)
2. Which hormone is lipid-soluble and binds to an intracellular receptor to alter
gene transcription?
A) Epinephrine
B) Thyroid Hormone (T3/T4)
C) Insulin
D) Glucagon
Answer: B (Thyroid hormones are amine-based but act like steroids—they are
nonpolar, bind to nuclear receptors, and initiate transcription. Epinephrine,
Insulin, and Glucagon are water-soluble and use membrane-bound
receptor/second-messenger systems.)
3. The hypothalamic-hypophyseal portal system connects the hypothalamus to
the:
A) Posterior pituitary
B) Anterior pituitary
C) Pineal gland
D) Adrenal medulla
Answer: B (This specialized blood supply carries releasing/inhibiting hormones
,(e.g., TRH, GnRH) directly from the hypothalamus to the anterior pituitary to
regulate its secretion. The posterior pituitary receives hormones via neural axons.)
4. A diabetic patient accidentally administers too much insulin. To counteract
the resulting hypoglycemia, which pancreatic hormone is rapidly released?
A) Somatostatin
B) Pancreatic polypeptide
C) Glucagon
D) Amylin
Answer: C (Glucagon is released by pancreatic alpha cells in response to low blood
glucose. It stimulates glycogenolysis and gluconeogenesis in the liver to raise
blood sugar back to normal.)
5. Which of the following hormones requires a binding protein (like TBG) for
transport in the blood, resulting in a very long half-life?
A) Cortisol
B) Aldosterone
C) T3/T4 (Thyroid hormones)
D) Growth Hormone
Answer: C (Over 99% of T3/T4 are bound to thyroxine-binding globulin (TBG) or
albumin. This protein binding prevents renal filtration and extends their half-life to
days, unlike water-soluble hormones which have half-lives of minutes.)
6. In the Renin-Angiotensin-Aldosterone System (RAAS), what stimulates the
juxtaglomerular (JG) cells to release renin?
A) High blood pressure in the renal artery
B) High Na⁺ concentration in the distal tubule
C) Decreased stretch of the afferent arteriole
D) Increased sympathetic inhibition
Answer: C (JG cells act as baroreceptors. A drop in systemic blood pressure
reduces stretch on the afferent arteriole wall, triggering renin release. Renin
converts angiotensinogen to Angiotensin I.)
7. A patient has Cushing's Syndrome (excess cortisol). Which finding is directly
caused by cortisol's permissive effect on other hormones?
,A) Severe hyperglycemia due to insulin overproduction
B) Enhanced vasoconstriction due to increased catecholamine effectiveness
C) Massive diuresis due to ADH suppression
D) Increased bone density due to calcium retention
Answer: B (Cortisol has a "permissive" effect on catecholamines
(epinephrine/norepinephrine), upregulating adrenergic receptors on blood
vessels. This leads to enhanced vasoconstriction and potential hypertension.)
8. Which hormone is primarily responsible for milk ejection (let-down reflex),
not milk synthesis?
A) Prolactin
B) Oxytocin
C) Estrogen
D) Progesterone
Answer: B (Oxytocin is released from the posterior pituitary and causes
myoepithelial cells in the mammary glands to contract, ejecting milk. Prolactin is
responsible for milk synthesis/production.)
9. A blood test shows high TSH, but low T3 and T4. This indicates pathology at
the level of the:
A) Hypothalamus
B) Anterior Pituitary
C) Thyroid Gland
D) Adrenal Cortex
Answer: C (This is classic primary hypothyroidism. The thyroid gland fails to
produce T3/T4, so the negative feedback on the anterior pituitary is lost, causing it
to overproduce TSH in a compensatory attempt to stimulate the failing gland.)
10. Which hormone exerts its primary effect by inserting Aquaporin-2 channels
into the apical membrane of collecting duct cells?
A) Aldosterone
B) Atrial Natriuretic Peptide (ANP)
C) Antidiuretic Hormone (ADH)
D) Parathyroid Hormone (PTH)
, Answer: C (ADH (Vasopressin) binds to V2 receptors on the collecting duct,
triggering a cAMP cascade that causes vesicles containing AQP-2 to fuse with the
luminal membrane, dramatically increasing water reabsorption.)
11. Calcitonin, produced by the parafollicular cells of the thyroid, is released in
response to:
A) High plasma calcium levels
B) Low plasma calcium levels
C) High plasma phosphate levels
D) Low plasma potassium levels
Answer: A (Calcitonin is the antagonist to PTH. It is released when blood Ca²⁺ is
high. It lowers Ca²⁺ by inhibiting osteoclast activity and reducing kidney
reabsorption. It is most important in children/bone remodeling, less so in adults.)
12. The adrenal medulla is essentially a modified sympathetic ganglion. What
does it secrete?
A) Cortisol and Aldosterone
B) Epinephrine and Norepinephrine
C) Androgens and Estrogens
D) Dopamine and Serotonin
Answer: B (The adrenal medulla is derived from neural crest cells. It secretes
catecholamines (80% epinephrine, 20% norepinephrine) directly into the
bloodstream in response to sympathetic stimulation.)
13. Which of the following describes a "tropic" hormone?
A) A hormone that acts on another endocrine gland to stimulate hormone release
B) A hormone that acts directly on skeletal muscle to increase contractility
C) A hormone that is released by neurons into the synaptic cleft
D) A hormone that circulates bound to albumin
Answer: A (Tropic hormones stimulate other glands. Example: TSH is tropic
because it acts on the thyroid; ACTH is tropic because it acts on the adrenal
cortex. They are the "hormones that control other hormones.")
14. Growth Hormone (GH) stimulates the liver to produce which insulin-like
growth factor that mediates long-bone growth?
2026 TEST BANK WITH 350 QUESTIONS AND
CORRECT ANSWERS
1. A patient has a tumor that secretes excessive Parathyroid Hormone (PTH).
Which lab result would you expect?
A) Hypercalcemia and hypophosphatemia
B) Hypocalcemia and hyperphosphatemia
C) Hypercalcemia and hyperphosphatemia
D) Hypocalcemia and hypophosphatemia
Answer: A (PTH increases blood Ca²⁺ by stimulating osteoclasts, increasing
intestinal absorption, and decreasing renal excretion. Simultaneously, it promotes
renal excretion of phosphate, leading to low serum phosphate.)
2. Which hormone is lipid-soluble and binds to an intracellular receptor to alter
gene transcription?
A) Epinephrine
B) Thyroid Hormone (T3/T4)
C) Insulin
D) Glucagon
Answer: B (Thyroid hormones are amine-based but act like steroids—they are
nonpolar, bind to nuclear receptors, and initiate transcription. Epinephrine,
Insulin, and Glucagon are water-soluble and use membrane-bound
receptor/second-messenger systems.)
3. The hypothalamic-hypophyseal portal system connects the hypothalamus to
the:
A) Posterior pituitary
B) Anterior pituitary
C) Pineal gland
D) Adrenal medulla
Answer: B (This specialized blood supply carries releasing/inhibiting hormones
,(e.g., TRH, GnRH) directly from the hypothalamus to the anterior pituitary to
regulate its secretion. The posterior pituitary receives hormones via neural axons.)
4. A diabetic patient accidentally administers too much insulin. To counteract
the resulting hypoglycemia, which pancreatic hormone is rapidly released?
A) Somatostatin
B) Pancreatic polypeptide
C) Glucagon
D) Amylin
Answer: C (Glucagon is released by pancreatic alpha cells in response to low blood
glucose. It stimulates glycogenolysis and gluconeogenesis in the liver to raise
blood sugar back to normal.)
5. Which of the following hormones requires a binding protein (like TBG) for
transport in the blood, resulting in a very long half-life?
A) Cortisol
B) Aldosterone
C) T3/T4 (Thyroid hormones)
D) Growth Hormone
Answer: C (Over 99% of T3/T4 are bound to thyroxine-binding globulin (TBG) or
albumin. This protein binding prevents renal filtration and extends their half-life to
days, unlike water-soluble hormones which have half-lives of minutes.)
6. In the Renin-Angiotensin-Aldosterone System (RAAS), what stimulates the
juxtaglomerular (JG) cells to release renin?
A) High blood pressure in the renal artery
B) High Na⁺ concentration in the distal tubule
C) Decreased stretch of the afferent arteriole
D) Increased sympathetic inhibition
Answer: C (JG cells act as baroreceptors. A drop in systemic blood pressure
reduces stretch on the afferent arteriole wall, triggering renin release. Renin
converts angiotensinogen to Angiotensin I.)
7. A patient has Cushing's Syndrome (excess cortisol). Which finding is directly
caused by cortisol's permissive effect on other hormones?
,A) Severe hyperglycemia due to insulin overproduction
B) Enhanced vasoconstriction due to increased catecholamine effectiveness
C) Massive diuresis due to ADH suppression
D) Increased bone density due to calcium retention
Answer: B (Cortisol has a "permissive" effect on catecholamines
(epinephrine/norepinephrine), upregulating adrenergic receptors on blood
vessels. This leads to enhanced vasoconstriction and potential hypertension.)
8. Which hormone is primarily responsible for milk ejection (let-down reflex),
not milk synthesis?
A) Prolactin
B) Oxytocin
C) Estrogen
D) Progesterone
Answer: B (Oxytocin is released from the posterior pituitary and causes
myoepithelial cells in the mammary glands to contract, ejecting milk. Prolactin is
responsible for milk synthesis/production.)
9. A blood test shows high TSH, but low T3 and T4. This indicates pathology at
the level of the:
A) Hypothalamus
B) Anterior Pituitary
C) Thyroid Gland
D) Adrenal Cortex
Answer: C (This is classic primary hypothyroidism. The thyroid gland fails to
produce T3/T4, so the negative feedback on the anterior pituitary is lost, causing it
to overproduce TSH in a compensatory attempt to stimulate the failing gland.)
10. Which hormone exerts its primary effect by inserting Aquaporin-2 channels
into the apical membrane of collecting duct cells?
A) Aldosterone
B) Atrial Natriuretic Peptide (ANP)
C) Antidiuretic Hormone (ADH)
D) Parathyroid Hormone (PTH)
, Answer: C (ADH (Vasopressin) binds to V2 receptors on the collecting duct,
triggering a cAMP cascade that causes vesicles containing AQP-2 to fuse with the
luminal membrane, dramatically increasing water reabsorption.)
11. Calcitonin, produced by the parafollicular cells of the thyroid, is released in
response to:
A) High plasma calcium levels
B) Low plasma calcium levels
C) High plasma phosphate levels
D) Low plasma potassium levels
Answer: A (Calcitonin is the antagonist to PTH. It is released when blood Ca²⁺ is
high. It lowers Ca²⁺ by inhibiting osteoclast activity and reducing kidney
reabsorption. It is most important in children/bone remodeling, less so in adults.)
12. The adrenal medulla is essentially a modified sympathetic ganglion. What
does it secrete?
A) Cortisol and Aldosterone
B) Epinephrine and Norepinephrine
C) Androgens and Estrogens
D) Dopamine and Serotonin
Answer: B (The adrenal medulla is derived from neural crest cells. It secretes
catecholamines (80% epinephrine, 20% norepinephrine) directly into the
bloodstream in response to sympathetic stimulation.)
13. Which of the following describes a "tropic" hormone?
A) A hormone that acts on another endocrine gland to stimulate hormone release
B) A hormone that acts directly on skeletal muscle to increase contractility
C) A hormone that is released by neurons into the synaptic cleft
D) A hormone that circulates bound to albumin
Answer: A (Tropic hormones stimulate other glands. Example: TSH is tropic
because it acts on the thyroid; ACTH is tropic because it acts on the adrenal
cortex. They are the "hormones that control other hormones.")
14. Growth Hormone (GH) stimulates the liver to produce which insulin-like
growth factor that mediates long-bone growth?
