Biology - Menstral cycle

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What are the main functions of an egg?
To carry the females DNA and to nourish the developing embryo
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What does the egg contain which feeds the embryo?
nutrients in the cytoplasm
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What happens straight after the egg is fertilized?
the eggs membrane changes structure to stop any more sperm getting in.
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Is the eggs nucleus haploid or diploid?
Hapliod - so that when the egg is fertilized the embryo has the right number of chromosomes.
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What are the functions of sperm?
to transport the males DNA to the females egg.
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What is the name of the sperms tale?
Flagella
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Is the males sperms nucleus haploid or diploid?
Hapliod - so that when the egg is fertilized the embryo has the right number of chromosomes.
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What does FSH stand for?
folicle- stimulating hormone
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What are the functions of FSH?
To cause a folicle (an egg and its surroundings) to mature in one of the ovaries and it stimulates the production of oestrogen.
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What does LH stand for?
luteinising hormone
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What is the function of LH?
It stimulates ovulation (day 14) it also stimulates the remains of the follicle to develop into a structure called a corpus luteum (which secretes progesterone).
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What is the function of oestrogen?
It causes the lining in the uterus to thicken and grow, a high level stimulates an LH surge (a rapid increase).
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What is the function of progesterone?
It maintains the lining of the uterus, It prevents the production of FSH and LH.
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During a menstral cycle, the levels of different hormones in the blood is controlled by a...?
Negative feeback loop
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After FSH has caused a follicle to mature, negative feedback loop keeps FSH...?
low, so that no more follicles mature.
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Card 2

Front

What does the egg contain which feeds the embryo?

Back

nutrients in the cytoplasm

Card 3

Front

What happens straight after the egg is fertilized?

Back

Preview of the front of card 3

Card 4

Front

Is the eggs nucleus haploid or diploid?

Back

Preview of the front of card 4

Card 5

Front

What are the functions of sperm?

Back

Preview of the front of card 5
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