Hormones, Mensrtual Cycle and Controlling Fertility
- Created by: isabella newsum
- Created on: 15-11-14 17:23
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- Hormones, Menstrual Cycle and Controlling Fertility
- Hormones
- Chemical Messengers which travel in the blood to activate target cells
- Produced in various glands
- Pituitary Gland
- Produces FSH and LH (Menstrual Cycle)
- Ovaries
- Produces Oestrogen (Menstrual Cycle)
- Pituitary Gland
- Slow in action, act for a long time, act in more general way
- Menstrual Cycle
- Stage 1- uterus lining breaks down (4 days)
- Stage 2- lining builds up again, ready to receive a fertilised egg
- Stage 3- an egg is released from Ovary (day 14)
- Stage 4- wall is maintained for 14 days, if no fertilised egg has landed on uterus wall by day 28, the lining breaks down- cycle starts again
- Follicle Stimulating Hormone- produced in Pituitary Gland, causes egg to mature in one of the ovaries, stimulates the ovaries to produce Oestrogen
- Oestrogen- produced in ovaries, cause Pituitary Gland to produce LH, inhibits the further release of FSH
- Luteinising Hormone- produced by Pituitary Gland, stimulates release of an egg
- Controlling Fertility
- The Pill (oral contraceptive)
- Pros
- Over 99% effective at preventing pregnancy
- Reduces risk of getting some types of cancer
- Cons
- Isn't 100% effective
- Side effects- headaches, nausea
- Doesn't protect against STD's
- Pros
- FSH and LH Injection
- Pros
- Become pregnant when they couldn't before
- Cons
- Doesn't always work- expensive
- Too many eggs stimulated- multiple pregnancies
- Pros
- IVF
- Pros
- Fertility treatment to give an infertile couple a child
- Cons
- Reaction- vomitting, dehydration
- Increase risk of cancer
- Multiple births
- Pros
- The Pill (oral contraceptive)
- Hormones
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