b5 - infertility and growth B5 ocr gateway b biology section on infertility and growth. 3.0 / 5 based on 1 rating ? BiologyGCSEOCR Created by: hotpotato12Created on: 19-01-13 20:13 what happens during the menstrual cycle briefly? day 1 - breakdown. 4-14 re-builds 14 - release egg. 14-28 maintain lining 1 of 14 what does FSH do? helps egg develop & stimulates OESTROGEN in ovaries 2 of 14 what does oestrogen do? repair lining & stimulates LH & inhibits FSH 3 of 14 what does LH do? release egg & indirectly stimulates PROGESTERONE 4 of 14 what does progesterone do? maintain lining & at low levels breaks it down & inhibits LH 5 of 14 how can you control fertility? the pill - contains oestrogen which mimics pregnancy by inhibiting FSH so stops egg production & development 6 of 14 what is genetic screening? amniocentesis - remove fluid and analyse chromosomes 7 of 14 what is genetic screening used for? checking for signs of downs syndrome and cystic fibrosis 8 of 14 what are the ethics surrounding genetic screening? if postitive test you can decide to terminate pregnancy. increase miscarriage risk. 9 of 14 what are the 4 different types of infertility treatments? artificial insemination - IVF - FSH injection - ovary transplant 10 of 14 what is growth influenced by? diet (proteins and minerals) - exercise (muscle & bone mass or stimulate growth hormone). 11 of 14 what are the 2 extremes of growth and what are the caused by? gigantism - pituitary gland tumour. dwarfism - stunted growth 12 of 14 why are we living longer? 1. treat fatal conditions. 2. safer work/housing. 3. better off. 4. less industrial disease 13 of 14 what are the disadvantages of longer life expectancy? - housing shortage - pensions - taxes for health care 14 of 14
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