Oral contraceptive pills and their packaging; each pill is marked with a date to prevent an omission of the daily dose. Contraceptive pills contain one or more of synthetic female sex hormones. Many types are a combination of an oestrogen,which blocks the process of ovulation (release of mature ovum - egg),and a progestogen,which acts on the pituitary gland to affect the normal menstrual cycle. Progestogens also increase viscosity of mucous in the cervix (neck of womb),providing a barrier to sperm should ovulation occur. Side- effects are numerous,including weight increase,nausea,depression,and a risk of thrombosis | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / McClenaghan, Andrew |
Taille de l’image : | 5079 px × 3522 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |