Infradian rhythm - the menstrual cycle

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how many hormones are in control of the menstrual cycle?
there are 5 hormones controlling the menstrual cycle
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when is the first hormone released and what is it called?
the first hormone is released on the 5th day of the cycle and is called the follicle stimulating hormone
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What does the follicle stimulating hormone do?
it promotes the growth of follicles in the ovaries.
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when is the second hormone released and what is it called?
the second hormone is released on the 7th day of the cycle, it is called oestrogen
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What does oestrogen do in terms of the menstrual cycle?
it builds the uterus lining and promotes the growth of the endometrium
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when is the third hormone released and what is it called?
the third hormone is released mid cycle (14th day) and it is called the luteinizing hormone
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what does the luteinizing hormone do?
it causes ovulation
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when is the fourth hormone released and what is it called?
the fourth hormone is released during ovulation and is called progesterone.
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what does progesterone do?
progesterone reinforces the oestrogen and builds up the endometrium to its maximum thickness.
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when is the fifth hormone released and what is it called?
the final hormone is secreted by the fertilised egg and is called HCG
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what does HCG do?
HCG maintains the corpus luteum and the endometrium.
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What are pheramones?
pheramones are biochemicals released by people into the air, for example sweat
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What can pheramones cause in terms of the menstrual cycle?
it has been suggested that pheramones can cause women who spend a lot of time together to have synchronised menstrual cycles.
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What is the menstrual cycle vital for? (IDA)
the menstrual cycle is vital for reproduction.
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What can cause a womans menstrual cycle to stop and why?
being under weight can cause your menstrual cycle to stop, this is because in evolutionary terms if a woman is underweight then this could lead to complications during pregnancy (infant mortality and health implications for the mother).
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What is an issue with using the evolutionary approach for the menstrual cycle?
we cannot go back in time to analyse womens menstrual cycles from hundreds of years ago.
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What are three pieces of research for the menstrual cycle?
Russell, McClintock and Reinberg
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What did Russell find?
that when sexually innactive women were exposed to pheramones of one woman 4/5 of the women had synchronised menstrual cycles within 1 day of the pheramone donor.
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What does the research by Russell show?
it shows that for most women other womens pheramones will reset their menstrual cycle. the study cannot tell us why this happens only that they can affect the cycle.
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What did McClintock find?
that male pheramones may reset a womans biological clock and that women who work with men often have shorter menstrual cycles.
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In evolutionary terms why does it not make evolutionary sense for all males to reset a womans menstrual cycle?
it would not make evolutionary sense for family member to reset a womans menstrual cycle.
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What did Reinberg find?
a woman who spent 3 months in a cave with a dim light had a shorter menstrual cycle (25.7 days).
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What does the findings by Reinberg suggest?
that the menstrual cycle can be altered according to the exposure of light.
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How is the case of Michel Siffre relevant?
his circadian rhythm was lengthened when he spent months living in a cave
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What does the case of Michel Siffre imply?
it implies that the sleep/wake cycle and the menstrual cycle are completely independant of each other.
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What is an issue with the research by Russell? (AO3)
there is low external validity, there is a small sample size and because the results were not 100% (4/5) we cant say that it is purely biological.
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Why is this biologically determinist? (wider evaluation)
it suggests the only factors that affect the menstrual cycle are biological factors such as stress and weight, although Reinberg suggested that light also plays a role.
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What is surprising about the menstrual cycle regarding research evidence?
considering it is an issue which affects 50% of the population there has been very little research conducted.
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Card 2

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when is the first hormone released and what is it called?

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the first hormone is released on the 5th day of the cycle and is called the follicle stimulating hormone

Card 3

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What does the follicle stimulating hormone do?

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Card 4

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when is the second hormone released and what is it called?

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Card 5

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What does oestrogen do in terms of the menstrual cycle?

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