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GCSE Biology · key term
The release of a mature egg from an ovary.
Used by AQA, Edexcel and OCR
Specification 4.5.3.4, 4.5.3.5, 4.5.3.6 · Paper 2
Revise: Hormones in Puberty and ReproductionUsually, one egg is released approximately every 28 days; its release from an ovary is called ovulation. The timing is approximate rather than identical for every person or every cycle.
The release of an egg from an ovary.
Avoid claiming that oestrogen directly triggers ovulation. It is involved in the reproductive cycle; luteinising hormone is the hormone that stimulates egg release.
On a hormone graph, identify the hormone from the shape and timing of its peak: the sharp LH surge occurs at about ovulation, whereas progesterone rises mainly after ovulation.
Treat day numbers as approximate. A cycle is approximately 28 days and ovulation is often shown near day 14, but graphs may use a different timescale.
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Specification 7.4, 7.5, 7.6, 7.8 · Paper 2
The release of an egg from an ovary.
Revise: Menstrual CycleOvulation is the release of an egg from an ovary. In a typical 28-day cycle it occurs at about day 14, although its exact timing varies. The egg enters an oviduct and travels towards the uterus.
The release of an egg from a mature follicle in an ovary.
Specification B3.2c, B3.2d, B3.2e, B3.2f · Paper 1 (Foundation), Paper 3 (Higher)
Revise: Hormones in human reproductionOvulation is the release of a mature egg from the ovary. If pregnancy does not occur, the lining is shed during menstruation, and a new cycle begins. A cycle is often described as about 28 days, but its length varies; ovulation is not guaranteed to happen on a fixed day.
The release of a mature egg from an ovary into an oviduct.
The release of an egg from an ovary.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The release of an egg from a mature follicle in an ovary.
Revise: Menstrual Cycle ControlOvulation should therefore not be treated as occurring on a fixed day in every cycle.
The release of an egg from a follicle in an ovary.
The release of an egg from an ovary.