Hormones in plants and humans
- Created by: puntm003
- Created on: 18-02-14 12:56
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- Hormones
- Humans
- Menstrual Cycle
- Stages
- 1
- Bleeding Starts
- Lining of the uterus lining breaks down for about 4 days
- 2
- Lining of the uterus builds back up again
- from day 4-14 a thick spongy layer builds up ready to receive a fertilised egg
- 3
- An egg is developed and released from the ovary at day 14
- 4
- The wall is maintained for 14 days until day 28
- If no fertilised egg has landed on the uterus wall by day 28 the lining will break down and the cycle starts again
- 1
- Hormone Control
- FSH (Follicle- Stimulating Hormone)
- Causes an egg to mature in one of the ovaries
- Stimulates the ovaries to produce oestrogen
- Produced by the pituitary gland
- Oestrogen
- Produced in the ovaries
- Causes the pituitary gland to produce LH
- Inhibits the further release of FSH
- LH (Luteinising Hormone)
- Produced by the pituitary gland
- Stimulates the release of an egg
- FSH (Follicle- Stimulating Hormone)
- Stages
- Increasing and Reducing Fertility
- Oestrogen can be used as a method of contraception as it prevents the release of an egg
- When taken every day it inhibits the release of FSH and the egg development and production stay stopped
- Progesterone reduces fertility by stimulating the production ot thick cervical mucus which stops sperm from getting through
- The pill is a contraceptive method, it combines oestrogen and progesterone
- Not 100% effective
- Reduces the risks of getting some types of cancer
- Can cause side effects
- FSH and LH can be injected to stimulate egg release
- Helps a lot of women to get pregnant
- It doesn't always work
- Too many eggs could be released causing unexpected multiple pregnancies
- Oestrogen can be used as a method of contraception as it prevents the release of an egg
- IVF
- Increasing and Reducing Fertility
- Oestrogen can be used as a method of contraception as it prevents the release of an egg
- When taken every day it inhibits the release of FSH and the egg development and production stay stopped
- Progesterone reduces fertility by stimulating the production ot thick cervical mucus which stops sperm from getting through
- The pill is a contraceptive method, it combines oestrogen and progesterone
- Not 100% effective
- Reduces the risks of getting some types of cancer
- Can cause side effects
- FSH and LH can be injected to stimulate egg release
- Helps a lot of women to get pregnant
- It doesn't always work
- Too many eggs could be released causing unexpected multiple pregnancies
- Oestrogen can be used as a method of contraception as it prevents the release of an egg
- Collecting eggs from womans ovaries and mixing them with mans sperm the transferring them into woman's uterus
- FSH and LH are given beforehand to stimulate egg production
- Increasing and Reducing Fertility
- Menstrual Cycle
- Plants
- Auxin
- Is a plant growth hormone
- Produced near the tips of shoots and roots
- Extra auxin in shoots helps it to grow
- Extra auxin in roots inhibits growth
- Growth in shoots and roots
- Phototrophism
- Shoot grows towards light
- Auxin is produced on opposite side to source of light
- This makes the cells elongate so the shoot bends towards the light
- Gravitropism
- When a shoot is growing sideways gravity makes more auxin accumulate on the lower side
- This makes the cells elongate and the shoot bends against gravity and upwards
- A root growing sideways will have more auxin on its lower side because of gravity
- The extra auxin inhibits growth on the lower side so the root bends down in the direction of gravity
- Geotropism
- If there is more water on one side of a plants roots more auxin is produced on the side with more water
- This inhibits the growth on that side making the root bend towards the water
- Phototrophism
- Auxin
- Humans
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