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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

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