control in the human body

  • Created by: nina
  • Created on: 27-05-13 19:29
what are hormones?
chemical substances that causes changes in the body
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where are hormones produced and released?
glands
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how do hormones travel to the target organ?
through the bloodstream
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what is the name for the maintenance of a constant internal enviornment?
homeostasis
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why is the water content in our bodies controlled?
to protect our cells from too much or too little water
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how is the water content in our bodies controlled?
exhaling, sweating and urine
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why is the ion content in our bodies controlled?
to protect our cells from too much or too little water
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how is the ion content in our bodies controlled?
by producing less insulin or taking it in
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why is the temperature of our bodies controlled?
to maintain the temperature at which enzymes work best (37degreesC)
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how is the temperature of our bodies controlled?
blood flow to the skin, sweating, shivering, respiration
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why are our blood sugar levels controlled?
to provide cells with a constant supply of energy
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how are blood sugar levels controlled?
by the release and storage of glucose which is controlled by insulin
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which hormone stimulates an egg to mature? which gland does it come from?
FSH from the pituitary gland
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what does oestrogen do?
thickens lining of uterus, inhibits production of FSH, stimulates release of LH
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which gland produces oestrogen?
ovaries
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what is ovulation and which hormone stimulates it?
release of the mature egg caused by LH
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which hormone does LH inhibit the production of?
oestrogen
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why does the uterus lining need to be thickened again after it has been shed?
so it can embed the egg if it's fertilised
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what hormones does the oral contraceptive pill contain?
oestrogen and progesterone
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how do oral contraceptives prevent pregnancy?
inhibit the production of FSH so no eggs mature because without no mature eggs there will be no pregnancy
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what were some of the side effects of the original birth control pills?
contained oestrogen only so caused blood clots, heart attacks and strokes
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what are 2 advantages of oral contraceptives?
decrease chances of pregnancy, effective, population control, easy to use, control period, control acne
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what are 2 disadvantages of oral contraceptives?
side effects, some religions/cultures against it, no protection against STDs, upsets natural bodily environment
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what hormones do fertility drugs contain?
FSH and LH
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what are the processes of IVF?
egg and sperm fertilised outside the womb. once these develop into embryos one or two are placed into the uterus of the mother
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what are 2 advantages of IVF?
allows people who can't become pregnant naturally to have kids, have 2 cycles free on NHS, allows older women to have kids
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what are 2 disadvantages of IVF?
side effects, not guaranteed to work, expensive, multiple births, some religions/cultures against it
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Card 2

Front

where are hormones produced and released?

Back

glands

Card 3

Front

how do hormones travel to the target organ?

Back

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Card 4

Front

what is the name for the maintenance of a constant internal enviornment?

Back

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Card 5

Front

why is the water content in our bodies controlled?

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