Hormonal coordination (menstrual cycle) Flashcards
Explain the menstrual cycle, including what happens in a pregnancy:
- normally 28 days long, day 1 is where the lining of the uterus (blood/tissue) breaks down and a woman begins her period. This is menstruation and lasts about 4 days.
- once finished, the uterus lining stats to repair and its thickness builds up again.
- day 2, a mature egg (ovum) is released from an ovary into the oviduct. This is ovulation and is why cramps are experienced.
- the ovum travels through the oviduct, where it may meet a sperm and become fertilised, the egg divides via mitosis, creating an embryo.
- the embryo travels into the uterus and implants itself into the lining, where it receives the nutrients and oxygen from the mother.
- if fertilisation doesn’t occur, the lining will break down and pass out, starting a new period that flushes out the unfertilised egg.
State the hormones involved in menstruation in order:
-FSH
-oestrogen
-LH
-progesterone
What is FSH’s impacts on the reproductive system and other hormones: Where is it produced?
pituitary gland
RS-
it makes the egg mature
H-
sends signals to the ovaries to produce oestrogen
What is oestrogen’s impacts on the reproductive system and other hormones: Where is it produced?
ovaries
RS-
builds the lining of the uterus up and stops the development of other eggs
H-
goes to the pituitary gland (bloodstream) stopping the production of FSH, and starting the production of LH
What is LH’s impacts on the reproductive system and other hormones: Where is it produced?
pituitary gland
RS-
tells the ovaries to ovulate, turning the follicle that once developed the egg into a yellow body
H-
yellow bodies produces progesterone
What is progesterone’s impacts on the reproductive system and other hormones: Where is it produced?
ovaries
RS-
builds up the lining of the uterus further to prepare for implantation of an embryo
H-
starts the production of FSH
