answers 2024\2025 A+ Grade
What is the first stage of the menstrual cycle (that lasts 4-7 days) known as?
- correct answer Menstrual Cycle
What is the second stage of the menstrual cycle (lasting 8-13 days) known as?
- correct answer Follicular Phase
What is the third stage of the menstrual cycle, occurring at day 14, known as?
- correct answer Ovulatory Phase
What is the final stage of the menstrual cycle known as?
- correct answer Luteal Phase
What occurs during the follicular phase of the menstrual cycle?
- correct answer 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
- correct answer A period of heightened hormones where a dominant follicle releases an egg into a
Fallopian tube.
Which hormone is responsible for ovulation?
- correct answer LH (Luteinizing Hormone)
What happens during the luteal phase of the menstrual cycle?
- correct answer Oestrogen decreases, progesterone increases due to the corpus luteum.
, What happens during the menstrual phase of the menstrual cycle?
- correct answer Oestrogen and progesterone decrease and the endometrial lining is shed.
How long is an egg viable for following ovulation?
- correct answer 1 day
What happens if an egg is not fertilised?
- correct answer Progesterone decreases, corpus luteum is reabsorbed and FSH causes new follicles to
start maturing.
Define capacitation
- correct answer 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?
- correct answer Cortical reaction - cortical granules block any other sperm from entering the egg
How many chromosomes does a zygote contain?
- correct answer 46, in 23 homologous pairs
How many cells does the merula have?
- correct answer 8 to 16
How many cells does the blastocyst have?
- correct answer 16 to 32
How many days after ovulation can implantation occur?
- correct answer 6 to 10 days
Define decidualisation
- correct answer Progesterone increases, creating a hospitable environment for the developing fetus.
What are trophoblasts?
- correct answer Cells on the outer layer of the blastocyst