ENDOCRINE: BRS PHYSIOLOGY EXAM QUESTIONS AND
ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
B. progesterone on the hypothalamus.
Curve A shows basal body temperature. The increase in temp. occurs as a result
of elevated progesterone levels during the luteal (secretory) phase of the
menstrual cycle. progesterone incr. the set-point temperature in the hypothalamic
thermoregulatory center.
The increase shown at point A is caused by the effect of
A. estrogen on the ant. pit
B. progesterone on the hypothalamus
C. FSH on the ovary
D. LH on the ant. pit.
E. prolactin on the ovary
C. progesterone. progesterone is secreted during the luteal phase of the
menstrual cycle.
Blood levels of which substance are described by curve B?
A. estradiol
B. estriol
C. progesterone
,D. FSH
E. LH
D. ovary. the curve shows blood levels of estradiol. the source of the increase in
estradiol concentration shown at point C is the ovarian granulosa cells, which
contain high concentrations of aromatase and convert testosterone to estradiol.
The source of the incr. in concentration indicated at point C is the
A. hypothalamus
B. ant. pit.
C. corpus luteum
D. ovary
E. adrenal cortex
C. corpus luteum.
the curve shows blood levels of estradiol. the source of the increase in estradiol
is the corpus luteum. the corpus luteum prepares the uterus to recieve a fertilized
egg. the HCG released from the placenta keeps the corpus luteum from
degenerating to the corpus albicans
The source of the incr. in concentration at point D is the
A. ovary
B. adrenal cortex
C. corpus luteum
, D. hypothalamus
E. ant. pit.
D. positive feedback of FSH on the ovary. point E shows the LH surge that
initiates ovulation at midcycle. the LH surge is caused by increasing estrogen
levels from the developing ovarian follicle. incr. estrogen by positive feedback,
stimulates the ant. pit. to secrete LH and FSH
The cause of the sudden incr. shown at point E is
A. negative feedback of progesterone on the hypothalamus
B. negative feedback of estrogen on the ant. pit
C. negative feedback of FSH on the ovary
D. positive feedback of FSH on the ovary
E. positive feedback of estrogen on the ant. pit
D. hypoparathyroidism after thyroid surgery. low blood Ca2+ and high blood PO4-
are consistent w/ hypoparathyroidism. Lack of PTH decr. bone resorption, decr.
renal Ca2+ reabsorption, and incr. renal PO4- reabsorption causing low urinary
PO4- to prevent Ca2+ from binding to PO4- in the urine. b/c the pt responded to
exogenous PTH, the PTH receptor is normal, so the issue is deficient PTH. most
of common cause of PTH deficiency is lesion of the parathyroids due to thyroid
surgery.
A woman has hypocalcemia, hyperphosphatemia, and decr. urinary phosphate
excretion. injection of PTH causes an incr. in urinary cAMP. the most likely dx is
ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
B. progesterone on the hypothalamus.
Curve A shows basal body temperature. The increase in temp. occurs as a result
of elevated progesterone levels during the luteal (secretory) phase of the
menstrual cycle. progesterone incr. the set-point temperature in the hypothalamic
thermoregulatory center.
The increase shown at point A is caused by the effect of
A. estrogen on the ant. pit
B. progesterone on the hypothalamus
C. FSH on the ovary
D. LH on the ant. pit.
E. prolactin on the ovary
C. progesterone. progesterone is secreted during the luteal phase of the
menstrual cycle.
Blood levels of which substance are described by curve B?
A. estradiol
B. estriol
C. progesterone
,D. FSH
E. LH
D. ovary. the curve shows blood levels of estradiol. the source of the increase in
estradiol concentration shown at point C is the ovarian granulosa cells, which
contain high concentrations of aromatase and convert testosterone to estradiol.
The source of the incr. in concentration indicated at point C is the
A. hypothalamus
B. ant. pit.
C. corpus luteum
D. ovary
E. adrenal cortex
C. corpus luteum.
the curve shows blood levels of estradiol. the source of the increase in estradiol
is the corpus luteum. the corpus luteum prepares the uterus to recieve a fertilized
egg. the HCG released from the placenta keeps the corpus luteum from
degenerating to the corpus albicans
The source of the incr. in concentration at point D is the
A. ovary
B. adrenal cortex
C. corpus luteum
, D. hypothalamus
E. ant. pit.
D. positive feedback of FSH on the ovary. point E shows the LH surge that
initiates ovulation at midcycle. the LH surge is caused by increasing estrogen
levels from the developing ovarian follicle. incr. estrogen by positive feedback,
stimulates the ant. pit. to secrete LH and FSH
The cause of the sudden incr. shown at point E is
A. negative feedback of progesterone on the hypothalamus
B. negative feedback of estrogen on the ant. pit
C. negative feedback of FSH on the ovary
D. positive feedback of FSH on the ovary
E. positive feedback of estrogen on the ant. pit
D. hypoparathyroidism after thyroid surgery. low blood Ca2+ and high blood PO4-
are consistent w/ hypoparathyroidism. Lack of PTH decr. bone resorption, decr.
renal Ca2+ reabsorption, and incr. renal PO4- reabsorption causing low urinary
PO4- to prevent Ca2+ from binding to PO4- in the urine. b/c the pt responded to
exogenous PTH, the PTH receptor is normal, so the issue is deficient PTH. most
of common cause of PTH deficiency is lesion of the parathyroids due to thyroid
surgery.
A woman has hypocalcemia, hyperphosphatemia, and decr. urinary phosphate
excretion. injection of PTH causes an incr. in urinary cAMP. the most likely dx is
