Upgrade to remove ads
regulation of reproductive cycle
Terms in this set (12)
why is it problematic to have missed taking several contraceptive pills?
1. levels of oestrogen and progesterone drop
2. possible follicle development and ovulation
3. unexpected pregnancy
other uses of contraceptive pills
-regulate length of menstrual cycle for women having irregular menstrual cycles
-reduce menstrual flow for women having heavy menses
what happen if the pills are taken continuously with no hormone-free intervals?
abnormal build-up of uterine lining
why take one pill every day at the same time?
ensures high levels of oestrogen and progesterone--> no follicle development and ovulation
what is the purpose of taking sugar pills without hormones?
develop a habit of taking a pill every day--> not forget to to start taking pills after 7 days
why are contraceptive pills made of synthetic hormones?
not destroyed in the stomach or broken down by liver--> metabolised slowly in the body
1. high levels of synthetic progesterone with/without oestrogen
2. rapid expulsion of fertilised ovum
3. prevent implantation of embryo in the uterine lining
side effects of hormonal contraceptions
-irregular menstrual bleeding
contraceptive pills/ patches/ injections
1. high levels of synthetic oestrogen and progesterone
2. inhibits secretion of follicle-stimulating hormones (FSH) and luteinising hormones (LH)
3. -low level of FSH--> no follicle development
-low level of LH--> no ovulation
4. no fertilisation
-ovulation problems (with FSH and LH)
-implantation problems (with oestrogen and progesterone)
-in combination of assisted reproductive techniques (ie in vitro fertilisation)
How can FSH and LH be prepared while they cannot be synthesised by artificial means?
FSH: extracted from urine or blood of women approaching menopause
LH: replaced by HCG extracted from human placentas
causes of infertility
-low sperm count
-low sperm mobility
-abnormal sperm shape
-blockage of sperm duct
-blockage of oviduct
-structural abnormalities of uterus
THIS SET IS OFTEN IN FOLDERS WITH...
Section 3 -- Plant Nutrition & Transport
Section 8 -- Ecology
The Nitrogen Cycle
YOU MIGHT ALSO LIKE...
The menstrual cycle
Higher Human Biology Unit 2
OTHER SETS BY THIS CREATOR
movement in humans
Past paper (hormonal control of reproduc…
Biology Ch. 13 Reproduction in Humans (F…