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125 terms

Endo test 3

STUDY
PLAY
the drug RU 486 has the ability to terminate pregnancy because it acts as a
progesterone antagonist
the polypeptide that binds to G protein coupled receptor 54 and stimulates neurosecretory neurons in the hypothalamus to release gonadotropin-releasing hormone GNRH is
kisspeptin
the actions of glucocorticoids on skeletal muscle and adipose tissue can be described as being anabolic in nature
false
the most important agent directly controlling aldosterone secretion from the adrenal cortex is
angiotensin II
the hormone that acts to inhibit prolactin induced milk secretion during pregnancy is
progesterone
the role of inhibin in males is to regulate the release of the following hormone via negative feedback control at the level of the hypothalamus and pituitary
FSH
the binding of isoproterenol to alpha adrenoceptors has a greater effect than does epinephrine binding to alpha adrenoceptors
false
identifiy the medical condition that is caused by a loss of 21 beta hydroxylase activity in the adrenal gland
congenital adrenal hyperplasia CAH
activation of beta adrenoceptors
increases cellular secretion
select the statement that correctly indicates the relationship between phase of the menstrual cycle and uterine condition and hormonal environment
follicular, proliferative, estrogenic
select the behavior or process that requires only the organizational effects of hormones
male rhesus monkey rough and tumble play behavior
the human fetal adrenal cortex produces what precursor for the synthesis of estrogen in the placenta
dehydroepiandrosterone sulfate
all of the following stimulate aldosterone synthesis
angiotensin II, ACTH, potassium
does not stimulate aldosterone synthesis
atrial natriuretic factor ANF
radiolabeled LH in the male specifically binds to
leydig cells
in order for the adult female to exhibit a cyclic release of GnRH the brain during embryonic development must be expose to
neither estradiol or testosterone
estradiol during pregnancy has all of the following actions except
inhibiting uterine contractions
estradiol during pregnancy has all of the following actions
increasing fat deposition, enlarging the uterus, breast and their ductal structures, relaxing the sacroiliac joint and pubic symphysis
select the correct statement pertaining to pineal function during a 24 hour light dark cycle
n acetyltransferase activity is highest during the dark cycle
epinephrine inhibits the release of insulin from the beta cells of the islets of langerhans because the beta cells have
more alpha than beta adrenergic receptors
the termination of pregnancy and the return of estrous behavior in a recently impregnanted female mouse after she is exposed to a foreign male mouse is termed
bruce effect
a complete lack of the enzyme 17 alpha-hydroxylase in the adrenal cortex causes the synthesis of a large amount of
aldesterone
the enzyme 3 beta hydroxysteroid dehydrogenase and delta 5 and delta 4 isomerase convert pregnenolone to
progetserone
mullerian ducts persist in normal females because of the
absence of mullerian inhibiting hormone
sympathetic postganglionic neurons release
most norepinephrine
in the nonpregnant human female the life of the corpus luteum is normally
12 days
both norplant as well as depoprovera when given over a long period of time prevent pregnacy because of the estrogen activity
false
one role of light in pineal function is to entrain or synchronize the pineal rhythm with the environment via an endogenous timekeeper believed to be located in the
suprachiasmatic nucleus
neither mullerian nor wolffian duct derivatives would develop from the indifferent stage of sexual development in
males with testicular feminization syndrome
sildenafil citrate, the active ingredient in Viagra, is useful in the treatment of male erectile dysfuction because it
prolongs the activity of cGMP
osteoporosis, hyperglycemia, thinning of the extremities, redistribution of body fat are all symptoms of
cushings syndrome
the initiation of spermatogenesis in the male requires
FSH and testosteorne
amenorrhea and anovulation are associated with excessive secretion of which of the following pituitary hormones
prolactin
the enzyme responsible for the termination of action of a catecholamine such as epinephrine is
catecholamine o methyltransferase
the major glucororticoid in humans is
cortisol
increased blood volume, hypernatremia, and alkalosis are symptoms of
hyperaldosteronism
in the general adaptation syndrome proposed by Hans Selye, all of the following are associated with the stage of exhaustion with the exception of
hypoglycemia
renin is produced mainly in the
juxtaglomerular cells of the kidney
the correct sequence of physiological events associated with the renin-angiotensis system
decreased blood pressure, increased renin release, increased angiotensin II formation, increased aldosterone synthesis
during the human menstrual cycle, progestrone levels are highest in the
luteal phase
the hormone in pregnant human females that prevents corpus luteum regression is
human chorionic gonadotropin
the sexually dimorphic nucelus of the preoptic area of the brain would not enlarge to the normal extent in male rats that
were treated with fadrazole an aromatase inhibitor during development
the following enzyme converts norepinephrine to epinephrine
phenylethanolamine N methyltransferase
the hormone that causes the cervical mucus to thicken during the curse of the menstrual cycle
progesteone
androgen binding protein synthesis in the sertoli cells is stimulalted by
FHS
the differentiation of the male external genitalia is most dependent upon which of the following hormones
5alpha-dihydrotestosterone
the reason why bronchial smooth muscle relaxes in response to epinephrine is that the lungs possess
only beta adrenergic receptors
the correct sequence for the synthesis of epinephrine starting from phenylalanine
phenylalanine, tyrosine, dopa, dopamine, norepinephrine, epinephrine
an antagonist to the nicotinic type of cholineric receptor is
curare
the changeover from the corpus luteum being the most important site of progesterone synthesis to the placenta being the most important site occurs during which month of pregnacy
3rd month
mullerian inhibiting hormone is primarily synthesized by
sertoli cells
para-aortic bodies paraganglia and pheochromocytomas are terms used for extra adrenal chromaffin tissue
true
the role of inhibin is to regulate the relase of the following hormones via negative feedback control at the level of the hypothalamus and pituitary
FSH
a complete lack of 17 alpha hydroxylase in the adrenal cortex would result in the synthesis of large amounts of
aldosterone
the reason why adrenergic beta receptor antagonists are used to treat individuals with hypertension or other cardiac problems is that
the cardiac beta adrenergic response is contraction
the primary hormone responsible for preparation of the reproductive tract for implantation by the zygote and the subsequent maintenance of the pregnancy is
progesterone
epinephrine binds to the beta adrenergic receptors and stimulates the activity of triglyceride lipases
true
the human fetal adrenal cortex produces what precursor for the synthesis of estradiol in the placenta
dehydroepiandrosterone sulfate
renin converts angiotensinogen
to angiotensin I
the drug RU 486 can terminate pregnancy in human females because it is an anti-estrogen that competes for the estrogen receptor
false
select the correct statement pertaining to pineal function during a 24 hour light dark cycle
N acetyltransferase activity is highest during the dark cycle
the male prostate gland is most highly stimulated by
5 alpha dihydrotestosterone
the reason why bronchial smooth muscle of the lungs relaxes in response to epinephrine is that they possess
only beta adrenergic receptors
5 alpha reductate
converts testosterone to dihydrotestosterone
the follicular phase of the human menstrual cycle usually begins aroudn what days of an average 28 day cycle
day 6
the hormone that acts to loosen the connective tissue connecting the two public bones during pregnacy is
relaxin
one role of light in pineal function is to entrain or synchronize the pineal rhythm with the environment via an endogenous timekeeper believed to be located in the
suprachiasmatic nucleus
excessive sodium in the body increased potassium loss in the urine, increased blood volume and hypertension are symtpoms of
hyperaldosteronism
estradiol and progesterone levels are at their lowes during which phase of the human menstural cycel
menstrual phase
chromaffin cells do not require
nerve growth factor for differentiation
chromaffin cells
stain brown in contact with oxidizing agents such as chromate, are modified postganglionic fibers, can convert norepinephrine to epinephrine via the action of the phenylethanolamine-N methyltransferase enzyme
in the human menstrual cycle the peak luteinizing hormone surge of each cycle takes place
twenty four hours after the peak in estradiol levels
testosterone is converted to estradiol via lthe action of
aromatase
according to the aromatization hypothesis male behavior in some vertebrates results from the action of what hormone within the brain cells during an early critical period
estradiol
although epinephrine binds to both alpha and beta adrenergic receptors the effect of epinephrine binding to the beta receptors is dominat
false
the reason why epinephrine stimulates glucagon secretion rom the alpha cells of the pancreatic islets is because these cells have relatively more alpha adrenoceptors than beta adrenoceptors
false
renin is produced mainly in the
juxtaglomerular cells of the kidney
in long day breeders melatonin often has
antigonadal activity
mullerian inhibiting hormone is primarily synthesized by
sertoli cells
the binding of isoproterenol to alpha adrenoceptors has a greater effect than does epinephrine binding to alpha adrenoceptors
false
ovulation in the human female usually occurs 9 hours
after the LH peak
the secretory capability of the uterus is directly stimulated by
progesterone
the blood levels of estradiol normally reaches a peak on what days of the 28 human menstrual cycle
12-13
the hormone synthesized late in pregnancy by the placenta, which increaes blood glucose levels and primes the mammary glands is
human chorionic somatomammotropin
which of the following statements concerning the activation of adrenoceptors is correct
activation of beta adrenoceptors increases cellular secretion
the most important agent directly controlling aldosterone secretion from the adrenal cortex is
angiotensin II
pitocin is
synthetic oxytocin
the major restraint on the onset of puberty appears to be at the level of the
brain
the phase of the human menstrual cycle that is described as being both secretory and progestational is the
luteal phase
congenital virilizing adrenal hyperplasia is associated with lower than normal levels of
21 beta hydroxylase
luteinizing hormone in the male stimulates the production of androgen-binding protein
false
androgen binding protein synthesis is stimulated by
FSH
adrenal steroids with 21 carbons and no oxygen on carbon 11 are in most cases
mineralocorticoids
correct sequenceof physiological events associated with the renin angiotensin system
increased renin release, increaed angiotensis II formation, increased aldosterone synthesis, increased blood pressure
in mammals, a castrated male and gonadally intact female that are both treated with testosterone during the indiferent stage of sexual development would subsequently have
both mullerian and wolffian ducts
neither mullerian nor wolffian duct derivatives would develop from the indifferent stage of sexual development in
males with testicular feminiziation syndrome
the hormone most responsible for blocking prolactin induced milk secretion is
progesterone
activational effects of hormones are those effects of hormone that resul from exposure to hormones early in development and which affect subseqnt morphology or behavior
false
female mammals most likely ahve cyclic pattern of GnRH release because of
the presence of alpha fetoprotein
estradiol levels are lowest during what portion of the human menstrual cycle
menstrual phase
the hormone in pregnant human females that prevents corpus luteum regression
human chorionic gonadotrpin
testosterone is converted to estradiol via the action of which of the following enzymes
aromatase
estradiol and progesterone levels are at their lowest during which phase of the human menstrual cycle
menstrual phase
the hormone most responsible for blocking prolactin induced milk secretion
progesterone
estradiol levels are lowest during what portion of the human menstrual cycle
menstrual phase
the secretory capability of the uterus is directly stimulated by
follicule stimulating hormone
in the human menstrual cycle the peak luteinizing hormone
twenty four hours after the peak in estradiol levels
the drug RU 486 can terminate pregnancy in human females because it is an antiestrogen that competes for the estrogen receptor
false
adrenal steroids with 21 carbons and no oxygen on carbon 11 are in most cases
mineralocorticoids
lutenizing hormone in the male stimulates the production of androgen binding proteins
false
congenital virilizing adrenal hyperplasia is associated with lower than normal levels of
21 beta hydroxylase
the reason why bronchial smooth muscle of the lungs relaxes in response to epinephrine is that they possess
only beta adrenergic receptors
the binding of isoproterenol to alpha adrenocepors has a greater effect than does epinephrine binding to alpha adrenoceptors
false
female mammals most likely have a cyclic pattern of GnRH release because of
the presence of alpha fetoprotein
which of the following statements concerning the activation of adrenoceptors is correct
activation of beta adrenoceptors increases cellular secretion
excessive sodium in the body, increased potassium loss in the urine, increased blood volume, and hypertension are symptoms of
hyperaldosteronism
the reason why adrenergic beta receptor antagonists are used to treat individuals with hypertension or other cardiac problems is that
the cardiac beta adrenergic response is contraction
androgen binding protein synthesis is stimulated by
FSH
the hormone in pregnant human females that prevents corpus luteum regression is
human chorionic gonadotropin
epinephrine binds to the beta adrenergic receptors and stimulates the activity of triglycerides lipases
true
the role of inhibin is to regulate the relase of the following hormones via negative feedback control at the level of the hypothalamus and pituitary
FSH
the human fetal adrenal cortex produces what precursor for the synthesis of estradiol in the placenta
dehydroepiandrosterone sulfate
activational effects of hormones are those effects of hormones that result from exposureto hormones early in development and which affect subsequent morphology or behavior
true
the hormone synthesized late in pregnancy by the placenta which increases blood glucose levels and primes the mammary glands is
human chorionic somatomammotropin
the reason why epinephrine stimulates glucagon secretion from the alpha cells ofthe pancreatic islets is because these cells have relatively more alpha adrenoceptors than beta adrenoceptors
true