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What is the first stage of the menstrual cycle (that lasts 4-7 days) known
as? - ✔✔Menstrual Cycle
What is the second stage of the menstrual cycle (lasting 8-13 days) known
as? - ✔✔Follicular Phase
What is the third stage of the menstrual cycle, occurring at day 14, known
as? - ✔✔Ovulatory Phase
What is the final stage of the menstrual cycle known as? - ✔✔Luteal Phase
What occurs during the follicular phase of the menstrual cycle? - ✔✔FSH
causes follicle maturation in the ovary. Increased oestrogen causes the
endometrium to thicken and become a nourishing environment for a
potential pregnancy.
Define Ovulation - ✔✔A period of heightened hormones where a dominant
follicle releases an egg into a Fallopian tube.
Which hormone is responsible for ovulation? - ✔✔LH (Luteinizing
Hormone)
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, What happens during the luteal phase of the menstrual cycle? -
✔✔Oestrogen decreases, progesterone increases due to the corpus
luteum.
What happens during the menstrual phase of the menstrual cycle? -
✔✔Oestrogen and progesterone decrease and the endometrial lining is
shed.
How long is an egg viable for following ovulation? - ✔✔1 day
What happens if an egg is not fertilised? - ✔✔Progesterone decreases,
corpus luteum is reabsorbed and FSH causes new follicles to start
maturing.
Define capacitation - ✔✔The protective covering of the acrosome of the
sperm is removed.
What sort of reaction begins when a sperm comes into contact with an
egg? - ✔✔Cortical reaction - cortical granules block any other sperm from
entering the egg
How many chromosomes does a zygote contain? - ✔✔46, in 23
homologous pairs
How many cells does the merula have? - ✔✔8 to 16
How many cells does the blastocyst have? - ✔✔16 to 32
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