Hormones Flashcards
Hormones
- Estrogens
- Progesterone
- Gonadotropins
Estrogen:
Steroids are produced by
______________________________
which share a common
biosynthetic pathway
Granulosa cells of:
follicles,
placenta,
adrenal cortex
Estrogen function
cause cellular proliferation
and growth of tissues related to reproduction including:
1. endometrial gland growth
2. duct growth in mammary gland
3. sexual receptivity
4. regulation of LH secretion
5. Regulation of PGF2a
6. increase sensory activity of UD
7. early union of epiphysis (growth of long bones ceases)
8. protein anabolism
9. epitheliotropic activity
Progesterone:
Steroid hormone produced by ___________________
- Corpus luteum
- Placenta
- Adrenal cortex
Progesterone function
- endometrial gland growth
- secretory activity of oviduct and endometrial glands for nutrients in developing embryo before implantation
- lobular growth in mammary gland
- prevention of contractility of uterus during pregnancy
- regulation of gonadotropin secretion
Gonadotropins
LH and FSH
Gonadotropins:
secreted by
APG
promotes growth of the follicle
FSH
involved in the ovulatory process and luteinization of the granulosa (forming the CL)
LH
Gonadotropins: Negative feedback controls hormonal levels
True
increases tonic levels
estrogen
decreases tonic levels,
progesterone
Gonadotropins: an increasing concentration of _______ causes an increase in
sensitivity of the anterior pituitary to GnRH, resulting to an increased release of gonadotropins
estrogen
Gonadotropins:
_______ decreases sensitivity of the anterior pituitary to
GnRH, and LH and FSH concentrations decrease
progesterone
The influence of estrogen on increasing gonadotropin
concentration depend on the the gradual increase of estrogen over time
true
