OCR GCSE Biology B · J257
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Infertility TreatmentsLH triggers ovulation: the follicle releases the egg. Giving these hormones can therefore help an egg develop and be released. If fertilisation then takes place inside the body, pregnancy may follow without IVF.