GCSE - Biology - Homeostatis and Response

Subdecks (1)

Cards (552)

  • If the Thyroxine levels are too high then...
    the pituitary gland releases Thyroid Stimulating Hormone
  • Genetic testing raises ethical issues as it...

    could lead to the selection of preferred characteristics
  • IVF often results in...
    unused embryos which have to be destroyed
  • Some women on IVF have a...
    strong reaction to the hormones so it is physically challenging
  • What is the average success rate for IVF in the UK?
    26%
  • FSH and LH are given before egg collection to...

    increase egg production do more than one can be collected
  • Once the embryos are tiny balls of cells...
    one or two of them are transferred into the uterus to improve he chances of pregnancy
  • The fertilised egg is grown into an embryo in a...
    laboratory incubator
  • What is the process called in which the sperm is injected directly into he egg if a mans sperm count is low?
    Intra-Cytoplasmic Sperm Injection
  • IVF involves collecting eggs from the ovaries and fertilising them in a...
    lab with the mans sperm
  • Cons of fertility drugs is that they are...
    expensive, not always effective and too many eggs could be released resulting in unexpected twins, triplets etc...
  • These hormones can be given to women as...
    fertility drugs to stimulate ovulation
  • If women have FSH that are too low then...
    no eggs will mature
  • What is the only way to make sure the sperm and egg never meet?

    Abstinence
  • Natural Methods' involve finding out when...
    the woman is most fertile and avoiding sex on these days (if people think barrier methods are unnatural)
  • Sterilisation in a man involves cutting or tying the...
    sperm duct
  • Sterilisation in a woman involves cutting or tying the...
    Fallopian tubes
  • Spermicide alone is only about...
    70-80% effective
  • It has to be used with a...
    spermicide to kill sperm
  • A diaphragm is a small plastic cup that fits over the...

    cervix (barrier)
  • Condoms are the only form of contraception that prevent...

    STDs because they act as a barrier
  • Copper IUDs
    prevent sperm from surviving in the uterus
  • Plastic IUDs...
    release progesterone
  • An IUD is a T-shaped device inserted into the...
    uterus
  • A contraceptive injection lasts...
    2-3 months
  • An Implant lasts...
    three years
  • The implant releases...
    progesterone
  • The contraceptive implant is inserted under...
    the skin of the arm
  • Its stuck to the skin and lasts...
    one week
  • The contraceptive patch contains...
    oestrogen and progesterone
  • The pill contains oestrogen and progesterone but...

    can cause headaches and nausea and doesn't protect against STDs (but is 99% effective)
  • Progesterone reduces fertility because it...

    produces a thick mucus which prevents sperm getting through
  • Oestrogen can prevent the release of an egg because it...
    inhibits the production of FSH so no eggs mature
  • Progesterone inhibits the release of...
    FSH and LH
  • When the progesterone levels fall...

    the lining breaks down
  • Progesterone maintains the ...
    lining of the uterus
  • Progesterone is produced in the...
    ovaries by the remains of the follicle
  • LH stimulates the release of...
    an egg at day 14
  • LH is produced by the...
    Pituitary Gland
  • Oestrogen stimulates the release of...?
    LH - which causes the release of the egg and inhibits the release of FSH.