Hormones

Question 1

Gonadootropin (GnRH)

Answer 1

secreted by: hypothalamus
acts upon: anterior pituitary
stimulated release FSH

provide the positive drive for secretion of both LH and FSH by the anterior pituitary

Question 2

Luteinizing Hormone

Answer 2

secreted by: anterior pituitary
acts upon: ovary
stimulated testosterone production in males
*maturation of follicle and spermatozoa
* induces ovulation and development for the CL

Question 3

Follicle Stimulating Hormone

Answer 3

secreted by: anterior pituitary
acts upon: ovary
* needed in small amounts
*induces follicular development
* induces estrogen production
* stimulates spermatogenesis

Question 4

Inhibin Hormone

Answer 4

secreted by: follicle
acts upon: anterior pituitary
* causes a reduction in FSH production by anterior pituitary

Question 5

Estrogen (Estradiol Hormone)

Answer 5

secreted by: follicle
* responsible for estrus
* influence mobility and secretory function in reproductive tract (uterine milk)
* responsible for early stage development of the mammary gland

Question 6

Progesterone Hormone

Answer 6

secreted by: corpus lutem
* “hormone of pregnancy”
* maintenance of pregnancy
* final maturation of mammary gland
* reduced excitability of smooth muscle fibers
* negative feedback to the hypothalamus

Question 7

Oxytocin Hormone

Answer 7

secreted by: posterior pituitary, corpus lutem
acts upon: smooth muscle
*causes contractions of smooth muscle fibers involved in milk “let down”, uterine contractions during parturition, contractions of smooth muscle in uterus and oviducts during mating

Question 8

Prostaglandin Hormone

Answer 8

secreted by: uterine lining
acts upon: corpus lutem
* produced by endometrium of non pregnant uterus
* causes the regression of the CL
* causes uterine contraction
* gives pregnant or open signal

Question 9

Interferon Tau

Answer 9

produced by: fertilized ovum
received by: uterus
blocks leuteolysis
*pregnancy recognition signal in cattle and sheep