Menstrual Cycle Flashcards
How many glands are involved in the Menstrual cycle and what are they?
2; Pituitary gland and Ovaries
What are the 4 hormones involved in the menstrual cycle?
- Follicle Stimulating Hormone
- Luteinising Hormone
- Oestrogen
- Progesterone
What role does FSH play in the menstrual cycle?
It stimulates the development of the Graafian Follicle in the Ovaries
Which hormones does the pituitary gland secrete for the menstrual cycle?
FSH and LH
Which hormones are secreted by the Ovaries?
Oestrogen and Progesterone
What is the Graafian Follicle?
A bundle of cells surrounding an ovum which provides nutrients to the ovum and secretes oestrogen
What effect does low oestrogen concentration have on the secretion of other hormones?
It inhibits FSH secretion by the pituitary gland (negative feedback response)
What effect does high oestrogen concentration have on the secretion of other hormones??
It stimulates FSH and LH secretion (positive feedback response)
What role does Oestrogen have in the Menstrual cycle?
Causes thickening of the endometrium wall
What role does LH have in the Menstrual Cycle?
LH release causes the release of the ovum from the follicle
What is the Graafian Follicle called when it has burst, releasing the ovum?
the Corpus Luteum
What role does the Corpus Luteum have in the Menstrual Cycle?
Secretes Progesterone
What role does progesterone play in the Menstrual Cycle?
It inhibits FSH and LH, which then consequently inhibits oestrogen and progesterone production, as it stops another egg from maturing.
How does the menstrual cycle end if no pregnancy occurs?
Menstruation is triggered by the degeneration of the Corpus Luteum no longer producing progesterone causing the shedding of the endometrium wall and the ovum. No Progesterone means FSH is no longer inhibited so the cycle begins again
