Biology 1A - Human Biology: Hormones in Humans
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- Created by: ex-Johnsonfamily
- Created on: 09-03-15 19:27
Aside from the Nervous System, what other way can you send information around the body?
Hormones.
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What are Hormones?
Hormones are chemicals released directly into the blood.
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How do hormones get to other parts of the body?
They are carried in the blood.
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What is the name of the particular cells that hormones affect?
Target Cells.
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What are hormones produced in and secreted by?
Glands.
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What is the full definition of a hormone?
Hormones are chemical messengers which travel in the blood to activate target cells.
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What does the pituitary gland do?
It produces hormones including FSH and LH. They're involved in the menstrual cycle.
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What do the ovaries do?
Ovaries produce oestrogen, which is involved in the menstrual cycle.
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Which complete actions faster, Nerves or Hormones?
Nerves, nerves have a fast reaction whilst hormones have a slower reaction.
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Which act for longer, Nerves or Hormones?
Hormones, nerves act for a short time whilst hormones act for a long time.
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Which act in a more precise area, Nerves or Hormones?
Nerves, nerves act in a very precise area whilst hormones act in a more general way.
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Describe the menstrual cycle in four stages.
Stage 1: The lining of the uterus breaks down and bleeding starts (Day 1) Stage 2: The lining of the uterus builids up, ready for a fertilised egg (Day 4) Stage 3: Egg released (Day 14) Stage 4: Lining of uterus maintained. (Day 14-28)
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Which three hormones are involved in the menstrual cycle?
FSH, Oestrogen, LH.
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What does FSH stand for?
Follicle-Stimulating Hormone
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What does LH stand for?
Luteinising Hormone
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Where is FSH produced?
The pituitary gland.
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Name two things that FSH does.
Causes an egg to mature in one of the ovaries. Causes ovaries to produce Oestrogen
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Where is Oestrogen produced?
The ovaries.
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What hormone does Oestrogen stop being released?
FSH.
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What does LH do?
LH causes the release of an egg from the ovaries.
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The pill is what type of contraceptive?
Oral.
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The first version of the pill contained high levels of what?
Oestrogen and Progesterone.
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There were concerns about a link between oestrogen in the pill and side effects, like what?
Blood clots.
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What happened to the pill to reduce the amount of side effects?
It now contains lower doses of oestrogen.
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Name two pro's of using the pill.
1. It is very effective at preventing pregnancy. 2. It reduces the risk of getting some types of cancer.
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Name three con's of using the pill.
1. There's still a very slight chance of getting pregnant. 2. It doesn't protect against STDs. 3. It can cause side effects like headaches.
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Some women's bodies cannot cause their eggs to mature. Why?
Their levels of FSH are too low.
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Which hormones do women inject to stimulate egg release in their ovaries?
FSH and LH.
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Name one pro of injecting FSH and LH.
It helps a lot of women to get pregnant.
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Name two cons of injecting FSH and LH.
1. It doesn't always work. 2. It can cause multiple pregnancies.
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What does IVF stand for?
In Vitro Fertilisation
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What does IVF involve?
Giving FSH and LH to a woman to stimulate egg production.
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Within IVF, what happens after eggs are produced?
They are collected from the woman's ovaries and fertilised in a lab using the man's sperm. The fertilised eggs grow into embryos. Then the cells are transferred to the woman's uterus.
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Name one pro of IVF.
It can give an infertile couple a child.
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Name two cons of IVF.
1. Some women have a strong reaction to the hormones - e.g. Vomiting 2. Multiple births can happen - these are risky for the mother and babies.
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Other cards in this set
Card 2
Front
What are Hormones?
Back
Hormones are chemicals released directly into the blood.
Card 3
Front
How do hormones get to other parts of the body?
Back
Card 4
Front
What is the name of the particular cells that hormones affect?
Back
Card 5
Front
What are hormones produced in and secreted by?
Back
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