BRS Endocrine Physiology Quiz: Trivia!
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(120).jpg "BRS Endocrine Physiology Quiz: Trivia!")
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- 1.
![The increase shown at point A is caused by the effect of
- ProProfs]( "The increase shown at point A is caused by the effect of")
The increase shown at point A is caused by the effect of- A.
Estrogen on the anterior pituitary
- B.
Progesterone on the hypothalamus
- C.
Follicle-stimulating hormone (FSH) on the ovary
- D.
Luteinizing hormone (LH) on the anterior pituitary
- E.
Prolactin on the ovary
- 2.
![Blood levels of which substance are described by curve B?
- ProProfs]( "Blood levels of which substance are described by curve B?")
Blood levels of which substance are described by curve B?- A.
Estradiol
- B.
Estriol
- C.
Progesterone
- D.
FSH
- E.
LH
- 3.
![The source of the increase in concentration indicated at point C is the
- ProProfs]( "The source of the increase in concentration indicated at point C is the")
The source of the increase in concentration indicated at point C is the- A.
Hypothalamus
- B.
Anterior pituitary
- C.
Corpus luteum
- D.
Ovary
- E.
Adrenal cortex
- 4.
![The source of the increase in concentrationat point D is the
- ProProfs]( "The source of the increase in concentrationat point D is the")
The source of the increase in concentrationat point D is the- A.
Ovary
- B.
Adrenal cortex
- C.
Corpus luteum
- D.
Hypothalamus
- E.
Anterior pituitary
- 5.
![The cause of the sudden increase shown at point E is
- ProProfs]( "The cause of the sudden increase shown at point E is")
The cause of the sudden increase shown at point E is- A.
Negative feedback of progesterone on the hypothalamus
- B.
Negative feedback of estrogen on the anterior pituitary
- C.
Negative feedback of follicle-stimulating hormone (FSH) on the ovary
- D.
Positive feedback of FSH on the ovary
- E.
Positive feedback of estrogen on the anterior pituitary
- 6.A woman has hypocalcemia, hyperphosphatemia, and decreased urinary phosphate excretion. Injection of parathyroid hormone (PTH) causes an increase in urinary cyclic adenosine monophosphate (cAMP). The most likely diagnosis is
- A.
Primary hyperparathyroidism
- B.
Vitamin D intoxication
- C.
Vitamin D deficiency
- D.
Hypoparathyroidism after thyroid surgery
- E.
Pseudohypoparathyroidism
- 7.Which of the following hormones acts on its target tissues by a steroid hormone mechanism of action?
- A.
Thyroid hormone
- B.
Parathyroid hormone (PTH)
- C.
Antidiuretic hormone (ADH) on the collecting duct
- D.
Rl adrenergic agonists
- E.
Glucagon
- 8.A man who has galactorrhea is found to have a prolactinoma. His physician treats him with bromocriptine, which eliminates the galactorrhea. The basis for the therapeutic action of bromocriptine is that it
- A.
Antagonizes the action of prolactin on the breast
- B.
Enhances the action of prolactin on the breast
- C.
Inhibits prolactin release from the anterior pituitary
- D.
Inhibits prolactin release from the hypothalamus
- E.
Enhances the action of dopamine on the anterior pituitary
- 9.Which of the following hormones originates in the anterior pituitary?
- A.
Dopamine
- B.
Growth hormone releasing hormone (GHRH)
- C.
Somatostatin
- D.
Gonadotropin-releasing hormone (GnRH)
- E.
Thyroid-stimulating hormone (TSH)
- F.
Oxytocin
- G.
Testosterone
- 10.Which of the following functions of the Sertoli cells mediates negative feedback control of follicle-stimulating hormone (FSH) secretion?
- A.
Synthesis of inhibin
- B.
Synthesis of testosterone
- C.
Aromatization of testosterone
- D.
Maintenance of the blood—testes barrier
- 11.Which of the following substances is derived from proopiomelanocortin (POMC)?
- A.
Adrenocorticotropic hormone (ACTH)
- B.
Follicle-stimulating hormone (FSH)
- C.
Melatonin
- D.
Cortisol
- E.
Dehydroepiandrosterone
- 12.Which of the following inhibits the secretion of growth hormone by the anterior pituitary?
- A.
Sleep
- B.
Stress
- C.
Puberty
- D.
Somatomedins
- E.
Starvation
- F.
Hypoglycemia
- 13.Selective destruction of the zona glomerulosa of the adrenal cortex would produce a deficiency of which hormone?
- A.
Aldosterone
- B.
Androstenedione
- C.
Cortisol
- D.
Dehydroepiandrosterone
- E.
Testosterone
- 14.Which of the following explains the suppression of lactation during pregnancy?
- A.
Blood prolactin levels are too low for milk production to occur
- B.
Human placental lactogen levels are too low for milk production to occur
- C.
The fetal adrenal gland does not produce sufficient estriol
- D.
Blood levels of estrogen and progesterone are high
- E.
The maternal anterior pituitary is suppressed
- 15.Which step in steroid hormone biosynthesis, if inhibited, blocks the production of all androgenic compounds but does not block the production of glucocorticoids?
- A.
Cholesterol —> pregnenolone
- B.
Progesterone —> 11-deoxycorticosterone
- C.
17-Hydroxypregnenolone —> dehydroepiandrosterone
- D.
Testosterone -, estradiol
- E.
Testosterone —> dihydrotestosterone
- 16.A woman has hirsutism, hyperglycemia, obesity, muscle wasting, and increased circulating levels of adrenocorticotropic hormone (ACTH). The most likely cause of her symptoms is
- A.
Primary adrenocortical insufficiency (Addison's disease)
- B.
Pheochromocytoma
- C.
Primary overproduction of ACTH (Cushing's disease)
- D.
Treatment with exogenous glucocorticoids
- E.
Hypophysectomy
- 17.Which of the following decreases the conversion of 25-hydroxycholecalciferol to 1,25- dihydroxycholecalciferol?
- A.
A diet low in Ca2+
- B.
Hypocalcemia
- C.
Hyperparathyroidism
- D.
Hypophosphatemia
- E.
Chronic renal failure
- 18.Increased adrenocorticotropic hormone (ACTH) secretion would be expected in patients
- A.
With chronic adrenocortical insufficiency (Addison's disease)
- B.
With primary adrenocortical hyperplasia
- C.
Who are receiving glucocorticoid for immunosuppression after a renal transplant
- D.
With elevated levels of angiotensin II
- 19.Which of the following would be expected in a patient with Graves' disease?
- A.
Cold sensitivity
- B.
Weight gain
- C.
Decreased 02 consumption
- D.
Decreased cardiac output
- E.
Drooping eyelids
- F.
Atrophy of the thyroid gland
- G.
Increased thyroid-stimulating hormone (TSH) levels
- H.
Increased triiodothyronine (r3) levels
- 20.Blood levels of which of the following substances is decreased in Graves' disease?
- A.
Triiodothyronine (T3)
- B.
Thyroxine (r,)
- C.
Diiodotyrosine (DIT)
- D.
Thyroid-stimulating hormone (TSH)
- E.
Iodide (I-)
- 21.Which of the following hormones acts by an inositol 1,4,5-triphosphate (IP 3)-Ca2+ mechanism of action?
- A.
1,25-Dihydroxycholecalciferol
- B.
Progesterone
- C.
Insulin
- D.
Parathyroid hormone (PTH)
- E.
Gonadotropin-releasing hormone (GnRH)
- 22.Which step in steroid hormone biosynthesis is stimulated by adrenocorticotropic hormone (ACTH)?
- A.
Cholesterol-* pregnenolone
- B.
Progesterone —> 11-deoxycorticosterone
- C.
17-Hydroxypregnenolone dehydroepiandrosterone
- D.
Testosterone —> estradiol
- E.
Testosterone -+ dihydrotestosterone
- 23.The source of estrogen during the second and third trimesters of pregnancy is the
- A.
Corpus luteum
- B.
Maternal ovaries
- C.
Fetal ovaries
- D.
Placenta
- E.
Maternal ovaries and fetal adrenal gland
- F.
Maternal adrenal gland and fetal liver
- G.
Fetal adrenal gland, fetal liver, and placenta
- 24.Which of the following causes increased aldosterone secretion?
- A.
Decreased blood volume
- B.
Administration of an inhibitor of angiotensin-converting enzyme (ACE)
- C.
Hyperosmolarity
- D.
Hypokalemia
- 25.Secretion of oxytocin is increased by
- A.
Milk ejection
- B.
Dilation of the cervix
- C.
Increased prolactin levels
- D.
Increased extracellular fluid (ECF) volume
- E.
Increased serum osmolarity
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