Which two effects does FSH have on the ovary?
Reveal answer
Matures an egg in a follicle; stimulates oestrogen.
Key words: oestrogen
4(a) REPRODUCTION · RECALL
4.10B FSH and LH in the menstrual cycle
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What triggers ovulation?
Reveal answer
A surge of LH.
Key words: LH
Which feedback effects does oestrogen have on the pituitary?
Reveal answer
Inhibits FSH, stimulates LH.
Key words: inhibits
What is meant by the term positive feedback?
Reveal answer
Response amplifies the original change.
Key words: positive feedback
Cycle hormone sequence: for FSH rises, give the main source and the principal effect.
Reveal answer
Main source: Anterior pituitary. Principal effect: Follicle develops; oestrogen rises.
Key words: FSH rises
Cycle hormone sequence: for Moderate oestrogen, give the main source and the principal effect.
Reveal answer
Main source: Developing follicle. Principal effect: Lining grows; FSH is inhibited.
Key words: Moderate oestrogen
Cycle hormone sequence: for Sustained high oestrogen, give the main source and the principal effect.
Reveal answer
Main source: Mature follicle. Principal effect: Positive feedback produces LH surge.
Key words: Sustained high oestrogen
Cycle hormone sequence: for LH surge, give the main source and the principal effect.
Reveal answer
Main source: Anterior pituitary. Principal effect: Ovulation and corpus luteum formation.
Key words: LH surge
Cycle hormone sequence: for Progesterone, give the main source and the principal effect.
Reveal answer
Main source: Corpus luteum. Principal effect: Lining maintained; FSH/LH inhibited.
Key words: Progesterone
True or false, and why? “FSH directly causes menstruation.”
Reveal answer
False. It develops a follicle; menstruation follows falling ovarian hormones.
True or false, and why? “LH remains at surge concentration for the whole cycle.”
Reveal answer
False. The surge is brief around ovulation.
True or false, and why? “Oestrogen always inhibits LH.”
Reveal answer
False. Sustained high oestrogen near mid-cycle stimulates the LH surge.
Which gland releases FSH and LH?
Reveal answer
The pituitary gland.
Key words: pituitary
What does FSH stand for?
Reveal answer
Follicle-stimulating hormone.
Key words: follicle
What does LH stand for?
Reveal answer
Luteinising hormone.
Key words: luteinising