Menstual Cycle Flashcards
What happens when FSH levels are too low?
Oestrogen levels also drop
High levels of progesterone inhibits:
FSH and LH
High level or oestrogen inhibits;
FSH
If progesterone levels drop then what will occur?
The endometrium will fall away
Name the hormone that is secreted by the corpus luteum:
Progesterone
What indicates that pregnancy has no occured?
The corpus luteum degenerates
Function of LH:
It acts upon the Graafian follicle to mature it
What hormone is secreted by the Graafian follicle?
Oestrogen
FSH:
Stimulates the growth of a follicle into the Graafian follicle
Which TWO hormones does the pituitary gland secrete for the menstrual cycle?
- FSH
- LH
On which day of the menstrual cycle does ovulation typically occur?
14
Ovulation:
The release of an ovum into the fallopian tubes
What causes ovulation to occur?
FSH and LH
The ovarian cycle refers to the changes in the:
Ovaries
The menstrual cycle starts when:
- Pituitary gland secretes LH
- Matures Graafian follicle
Menstrual cycle:
When: 28 day cycle
Where: ovaries and uterus
Why: to produce a mature ovum and prepare the uterus for possible implantation
Ovarian cycle steps:
- pituitary gland secretes FSH(stimulates Graafian follicle)
- follicle produces oestrogen causing endometrium to thicken/repair
- pituitary gland secretes LH
- FSH and LH mature Graafian follicle
- ovulation occurs
- Corpus Luteum remains and secretes progesterone which is sent to the endometrium
Uterine cycle steps:
- oestrogen from follicle repairs and thickens endometrium
- ovulation occurs
- progesterone make the endometrium thicker and more vascular
- oestrogen and progesterone inhibit the secretion of FSH and LH
- if pregnancy does not occur, corpus luteum shrinks
- progesterone levels drop as well as oestrogen levels
- endometrium falls away
- FSH is no longer inhibited and rises
