OCR Cambridge Nationals: Child Development RO18 Practice Exam

A contraceptive implant is indeed a tube that releases progesterone and is inserted into the arm. This method of contraception works by slowly releasing hormones into the bloodstream, which prevents ovulation, thickens the cervical mucus to block sperm, and thins the lining of the uterus to reduce the likelihood of implantation.

The effectiveness of the contraceptive implant is notable, as it can prevent pregnancy for several years, depending on the type used. This long-acting reversible contraception provides a convenient option for individuals who prefer not to think about daily or monthly contraceptive methods.

In terms of context, while other options describe different forms of contraception, they do not specifically refer to the implant's function or method of delivery. For example, the option mentioning a small tube that releases oestrogen refers to a different hormonal contraceptive method, and the option describing a device inserted into the uterus pertains to an intrauterine device (IUD), which functions differently than the implant. Barrier methods, like condoms, physically block sperm from reaching the egg and do not involve hormonal release at all, further clarifying the uniqueness of the contraceptive implant.