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I/GCSE Biology - Hormones in the menstrual cycle

Hormones in the menstrual cycle/Reproduction

· IGCSE,Biology,Hormones,FSH,LH

Hormones 👩‍⚕️

  • In I/GCSE Biology, many processes within the body are coordinated by chemical substances called hormones.
  • Hormones are secreted by glands and are transported to their target organs by the bloodstream.
  • Hormones regulate the functions of many organs and cells.

Hormones in the menstrual cycle

  • FSH – follicle stimulating hormone

Secreted from:pituitary gland

Effects:egg matures in ovary and Release of oestrogen from ovary 

Secreted from:ovaries

Effects:inhibits release of FSH and causes release of LH

  • Oestrogen

Secreted from:ovaries

Effects:inhibits release of FSH and causes release of LH

  • LH – luteinising hormone 

Secreted from:pituitary gland

Effects:stimulates release of egg from ovary

Controlling Reproduction

Increasing fertility

FSH is given as a fertility drug to woman whose own level of FSH is too low to stimulate eggs to mature. 

IVF – In Vitro Fertilisation🩺

  • Fertility drugs are given to increase egg production.
  • Eggs are removed and fertilised with sperm outside the body.
  • These can be allowed to develop into embryos.
  • They may be implanted back into the womb of the mother.
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Benefits:

  • Enables infertile couples to have children.
  • Excess embryos can be used for research.

Concerns:

  • Procedures are expensive.
  • Health risks for the mother.
  • Multiple births – some babies may die.
  • People do not like embryos to be used for research.

Oral contraceptives 💊

Contain hormones that inhibit FSH production so that no eggs mature.

Benefits:

It can reduce population growth in the developed world.

Concerns:

  • Health problems – eg some increase the risk of blood clots.
  • Religious objections to preventing conception.

That's the end of the topic!

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Drafted by Joey (Biology)

Reference:

https://getrevising.co.uk/resources/biology_revision_notes4

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