Back to AI Flashcard MakerBiology /Biology IB HL - 6.6 Homeostasis Part 6
Down Regulation - What drugs are taken to start the process?
Drugs are used to halt the regular secretion of FSH and LH – this in turn stops the secretion of estrogen and progesterone
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Key Terms
Term
Definition
Down Regulation - What drugs are taken to start the process?
Drugs are used to halt the regular secretion of FSH and LH – this in turn stops the secretion of estrogen and progesterone
Down Regulation - What is the purpose of arresting the hormonal cycle?
By arresting the hormonal cycle, doctors can take control of the timing and quantity of egg production by the ovaries
Down Regulation - How long does this stage last and how is the drug treatment administered?
The drug treatment usually takes about two weeks and is typically delivered in the form of a nasal spray
Superovulation - What does this stage involve?
Superovulation involves using artificial doses of hormones to develop and collect multiple eggs from the woman
Superovulation - What is the woman injected with?
The patient is firstly injected with large amounts of FSH to stimulate the development of many follicles
Superovulation - What are the follicles then treated with?
The follicles are then treated with human chorionic gonadotrophin (hCG) – a hormone usually produced by a developing embryo
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| Term | Definition |
|---|---|
Down Regulation - What drugs are taken to start the process? | Drugs are used to halt the regular secretion of FSH and LH – this in turn stops the secretion of estrogen and progesterone |
Down Regulation - What is the purpose of arresting the hormonal cycle? | By arresting the hormonal cycle, doctors can take control of the timing and quantity of egg production by the ovaries |
Down Regulation - How long does this stage last and how is the drug treatment administered? | The drug treatment usually takes about two weeks and is typically delivered in the form of a nasal spray |
Superovulation - What does this stage involve? | Superovulation involves using artificial doses of hormones to develop and collect multiple eggs from the woman |
Superovulation - What is the woman injected with? | The patient is firstly injected with large amounts of FSH to stimulate the development of many follicles |
Superovulation - What are the follicles then treated with? | The follicles are then treated with human chorionic gonadotrophin (hCG) – a hormone usually produced by a developing embryo |
Superovulation - What is the role of hCG? | hCG stimulates the follicles to mature and the egg is then collected (via aspiration with a needle) prior to the follicles rupturing |
Fertilisation - What happens to the extracted eggs? | The extracted eggs are then incubated in the presence of a sperm sample from the male donor. The eggs are then analysed under a microscope for successful fertilisation |
Implantation - What occurs roughly two weeks before this stage? | Approximately two weeks prior to implantation, the woman begins to take progesterone treatments to develop the endometrium |
Implantation - What is implanted into the uterus? | Healthy embryos are selected and transferred into the female uterus (or the uterus of a surrogate) |
Implantation - How many embryos are implanted and why? | Multiple embryos are transferred to improve chances of successful implantation (hence multiple births are a possible outcome) |
Implantation - What is done to check whether the procedure was successful? | Roughly two weeks after the procedure, a pregnancy test is taken to determine if the process has been successful |
Mnemonic to remember the key stages of IVF | Stop normal menstrual cycle (with drugs); Hormone treatments to promote super ovulation; Extract multiple eggs from the ovaries; Sperm collected, then prepared (via capacitation) and injected into egg; Fertilisation occurs externally under controlled conditions (in vitro); Implantation of multiple embryos into uterus (either patient or surrogate); Test for pregnancy after ~ two weeks; Mnemonic: SHE’S FIT |