Endocrine & Repro Flashcards
What gland or organ makes up the Endocrine system?
adrenals, pituitary, thyroid, ovaries, testicles, kidneys, pancreas
What is the endocrine system composed of?
Ductless glands that secrete chemical messengers called hormones
_____ are chemical substances produced by cells in one part of the body and transported to another part of body where they influence _____ _____.
Hormones
Cellular activity
T or F
The endocrine system and nervous system make up two major control mechanisms if the body and linked together through the complex integrating action of the hypothalamus
True
The endocrine system and _____system make up the two major control ______ of the body and are linked together through the complex integrating action of the____.
Nervous
Mechanisms
Hypothalamus
Hormones are generally administered to animals for two reasons
1) to correct a dificiency of that hormone
2) to obtain a desired effort
Hormones that are administered to an animal are called—– hormones
Exogenous
Hormones produced naturally in the body are called _____ hormones.
Endogenous
Hormones that are admin to an animal are called _____ hormones whereas those produced naturally in the body are called ______ hormones.
Exogenous
Endogenous
Which gland is called the master gland?
Pituitary
Why is the pituitary gland called the master gland of the endocrine system?
Because of the control it exerts over the regulation of this system.
Pituitary gland is controlled by _____.
Hypothalamus
Where is the pituitary located?
At the base of the brain just ventral to the hypothalamus and is connected to the brain by a stalk.
How is the pituitary gland connected to the brain?
By a stalk
Pituitary is located at the base of the brain just _____ to the hypothalamus.
Ventral
The pituitary is divided into two main lobes:
1) anterior lobe (adenohypophysis)
2) posterior lobe (neurohypophysis)
Where does the anterior lobe arise from?
Embryo logic pharynx
Where does the posterior lobe arise from?
Brain
Anterior lobe or ______ is ______ hormones and _____ acting.
Adenohypophysis
Tropic
Indirect
Posterior lobe or _____ is _____ acting
Neurohypophysis
Direct
How does the hypothalamus exert control over the anterior pituitary?
Through the transport of releasing hormones, or factors, down the hypophyseal portal system.
In the anterior pituitary the factors release causes the secretion of ____ hormones into the circulation
Tropic
Tropic hormones produced by the anterior pituitary:
Thyroid stimulating hormone (TSH) Adrenocorticotropic hormone (ACTH) Luteinizing hormone (LH) Follicle stimulating hormone (FSH) Prolactin (LTH) and Growth hormone (GH or somatotropin )
The tropic hormones are sometimes called _____ acting hormones
Indirect
Why are TSH, ACTH, LH,FSH, LTH, and GH called indirect acting hormone?
They are tropic hormones *
Because the cause their target organ to produce a second hormone, which in turn influences a second target organ or tissue.
Hormones of the posterior pituitary are?
Vasopressin (antidiuretic hormone) and oxytocin
T or f hormones of the posterior pituitary are vasopressin and oxytocin?
True
The hormones of the posterior pituitary are called indirect acting hormones?
False direct acting hormones
The hormones of the posterior pituitary are called direct acting hormones because they produce the desired activity _____ in the target _____.
Directly
Organ
Anterior lobe
TSH stimulates ____ to produce T3/T4
Thyroid
TSH (Thyroid stimulating hormone)
stimulates thyroid to produce ______.
T3/T4
Anterior lobe
FSH stimulates ______ follicle growth and spermatogenesis
Ovarian
T or f
FSH (Follicle stimulating hormone) stimulates ovarian follicle growth and spermatogenesis
T
Anterior lobe
LH stimulates _____ and ______ production
Ovulation
Testosterone
Anterior lobe
GH ( growth hormone) accelerates body growth and increases _____ ______
Milk production
What does GH do?
Accelerates body growth and increase milk production
Anterior lobe
ACTH (adrenocortcotropic hormone) stimulates production of____ by _____ cortex
Corticosteroids
Adrenal
T or F
ACTH stimulates production of corticosteroids by adrenal cortex
T
Posterior lobe
OXYTOCIN stimulate _____ contraction and milk letdown
Uterine
OXYTOCIN stimulated uterine contraction and ____ ______
Milk letdown
Posterior lobe
ADH stimulates —– retention
Water
Does ADH stimulate water retention?
Yes
Feedback mechanism
T or f
The plasma level of a particular hormone controls the activity of the gland that produces it
T
Feedback mechanism
The ____ level of a particular hormone controls the ____ if the gland that produces it
Plasma
Activity
Feedback can be
Negative
Positive
Negative feedback : high plasma levels of a hormone are sensed by the _____ which than reduces the amount of the appropriate ______ factor ( hormone)
Hypothalamus
Releasing
T or f
Negative feedback a decreased amount of releasing factor reduces the amount of tropic hormones released by the pituitary causing less activity in the organ
T
Negative feedback the overall effect is to _____ the amount if hormone in the _____
Lower
Plasma
Negative feedback high plasma levels of a hormone are sensed
T or f
T
Negative feedback is the overall effect is lower the amount of hormone in the plasma
Y or n
Y
Positive feedback
Is high or low levels of hormone sensed by the hypothalamus?
Low
Positive feedback
Low levels of a hormone are sensed by the hypothalamus and release of the appropriate releasing factors
Decrease or increases
Increases
Positive feedback
Increase amounts of the corresponding tropic hormone are secreted causing activity in the target organ and a corresponding _____ in plasma levels of the hormone
Rise
In positive feedback low levels of a hormone are sensed by the hypothalamus and release of the appropriate releasing factors increase
T or f
T
Positive feedback
Increased amounts of the corresponding _____ hormone are secreted causing activity in target organ and corresponding _____ in plasma levels of hormone
Tropic
Rise
Neurohormonal reflex applies to the release if _____ by the posterior pituitary
Oxytocin
How can the neurohormonal reflex be initiated?
By stimulating of the udder by a nursing calf
Preparation of the udder for milking
Stimulation of the uterus and vagina in parturition
Stimulation of the cerebral cortex by sensory stimuli associated with nursing or milking
Reproductive system
The four stages of reproductive cycle (estrus)
1) proestrus
2) estrus
3) diestrus
4) anestrus
Name the two phases that the cycle can be divided into?
Follicular phase
Literal phase
In the follicular phase the cycle is under the influence of ____ produced by a developing ____ .
Estrogen
Follicle
Which phase, follicle or literal, is under the influence of estrogen produced by a developing follicle?
Follicular
In the literal phase the cycle is under the influence of _____ made by the corpus luteum
Progesterone
Where is control of the reproductive system coordinated?
In the hypothalamus
Control of the reproductive system is coordinated In the ____ where the ______ releasing hormone (GnRH)is produced in response to various _____
Hypothalamus
Gonadotropin
Stimuli
The various stimuli that produces GnRH are
Day and night length ( photoperiod)
Pheromones
Positive and negative internal feedback mechanisms
What does GnRH cause the release of
FSH and LH from the anterior pituitary
T or f
GnRH causes the release of FSH and LH from the anterior pituitary
T
What does FSH cause the growth and maturation of?
A follicle which begins to produce increasing amounts of estrogens as it matures
FSH causes growth and maturation of a follicle which begins to produce increasing amounts if _____ as it matures
Estrogen
______ causes changes that occur in proestrus and estrus
Estrogen
Estrogen causes changes in _____ and _____.
Proestrus
Estrus
The follicle also produces ____ which along with estrogen serves as negative feedback to _____ to inhibit release of GnRH
Inhibin
Hypothalamus
____release cause ovulation of the mature follicle and the formation of corpus luteum in its place
LH ( luteinzing hormone)
LH release causes _____ of the mature follicle
Ovulation
LH release causes ovulation of the mature follicle and the formation of ____ luteum in its place
Corpus
After LH release and formation of corpus liteum it signals the beginning of _____and the beginning of the ____ phase of cycle
Diestrus
Luteal
T or f
The corpus luteum produces progesterone which the uterus for pregnancy
T
The corpus luteum produces ____ which prepares the uterus for pregnancy
Progesterone
Once pregnancy occurs, the corpus luteum maintains a uterine envy conducive to normal progression of the pregnancy
T or f
T
Progesterone levels in the blood serve as _____ feedback to prevent release of ____ and the development of new follicles during pregnancy
Negative
GnRH
____level in the blood serve as negative feedback to prevent the release of GnRH
Progesterone
When the gestation period is at the end the fetus produces increasing amounts of ____
ACTH (adrenocortcotropic hormone)
When does the fetus produce an increasing amount of ACTH
When the gestation period is near the end
When the fetus produces increasing amount of ACTH it causes an increase amount of ____ to be produced by the adrenal gland
Cortisol
Increased cortisol levels result in increased production of ____ and ____ by the uterus
Estrogen
Prostaglandin
Estrogen and progstaglandin sensitize the uterus to the contraction producing effects of ______ and allows parturition to begin
Oxytocin
What causes the breakdown(lysis) of the corpus luteum at the end of pregnancy and end of diestrus if pregnancy doesn’t occur
Prostaglandin
What is the reason for use of hormonal drugs
Synchronization of estrus Suppression of estrus Induction of estrus Treatment of cystic ovaries Termination of pregnancy
Name 5 hormonal drugs
Gonadotropins Estrogens Androgens Prostaglandin Progestin a
Gonadotropin are drugs that are similar to _____, _____,______.
GnRH
LH
FSH
Gonadotropin causes release of____, ____.
LH
FSH
FSH that’s released by Gonadotropin causes what to grow and mature in females? And what in males
Ovarian follicle in females
Spermatogenesis in males
In Gonadotropin LH causes____ in females and production of ____ in males
Ovulation
Testosterone
_____causes ovulation in females and production of testosterone in males
LH
_____is a group of hormones synthesized by the ovaries and less extent the testicles, adrenal cortex and placenta
Estrogens
What is estrogens classified as?
Sex steroids
Which hormonal drug is classified as a sex steroids?
Estrogens
Estrogen is necessary for normal growth and development of the female ______.
Gonads
Name three things that estrogen does
Inhibit ovulation
Increase uterine tone
Cause proliferation of the endometrium
What is estrogen clinical used in dogs used for?
Induce abortion
Control urinary incontinence
List the side effects of estrogen
Prolonged estrus
Serve anemia
Genital irritation
Follicular cysts
Which drug has the side effect of serve anemia and prolonged estrus?
Estrogen
Where is the male sex hormone androgen found?
Testicles
Ovaries
Adrenal cortex
Question should say produce not found
Which hormonal drug is necessary for growth and development of male sex organs?
Androgens
Androgens causes secondary male sex characteristics
T or f
T
Androgen promotes tissue anabolism, weight gain , and ____ formation
rbc
_____ products are C-111 controlled substances
Testosterone
Testosterone products are ______ controlled substance
C-111
____are similar to progesterone and are produced by corpus luteum
Progestins
What does Progestins do
Cause increase secretions by the endometrium
Decreased motility in the uterus
Increased secretory development in mammary glands
Which hormonal drug is similar to progestrone
Progestin
Which hormonal drug suppresses estrogen and treats false pregnancy
Progestins
What is Progestins clinically used for?
To suppress estrus
Treat false pregnancy
Behavioral disorders
Progestin responsive dermatitis
Prostaglandins consists of a group of naturally occurring long chain ____acids
Fatty