Function of Copper-T is to inhibit:

Question

Accepted Answer

The correct option is 1: Fertilization

The Copper-T is a highly effective, long-acting, reversible contraceptive device (LARC) classified as an Intrauterine Device (IUD). Its primary mechanism of action relies heavily on the slow, continuous release of copper ions (Cu²⁺) into the uterine and tubal environment. These copper ions are toxic to sperm, creating a hostile environment that severely impairs their function. Specifically, Cu²⁺ ions suppress sperm motility and vitality, essentially acting as a potent spermicidal agent. They also interfere with the process of capacitation—the final maturation step required for sperm to be able to fertilize an egg. By immobilizing and killing most sperm before they can reach the egg in the fallopian tube, the Copper-T’s most immediate and critical function is the prevention of fertilization. While it does have secondary mechanisms, the impairment of sperm transport and survival that prevents the union of gametes is considered its principal mode of contraceptive action.

The incorrect option is 2: Ovulation

Ovulation refers to the monthly release of an egg from the ovary. The Copper-T is a non-hormonal IUD; its contraceptive effect is localized to the uterus and fallopian tubes and is mediated primarily by copper ions, not by systemic hormonal suppression. Since it does not interfere with the hypothalamic-pituitary-ovarian axis, it does not prevent follicular development or the surge of Luteinizing Hormone (LH) necessary for ovulation. Therefore, women using a Copper-T continue to ovulate normally and maintain their regular menstrual cycles. Its mechanism is to prevent the consequence of intercourse (fertilization), not the production of the egg itself.

The incorrect option is 3: Implantation of blastocyst

Implantation is the process where a fertilized egg (now a blastocyst) embeds itself into the uterine lining (endometrium). While Copper-T *does* make the endometrium chemically unsuitable for implantation by inducing a sterile, local inflammatory response, this is widely considered its *secondary* and less critical mechanism. The massive reduction in viable sperm, leading to the inhibition of fertilization, is the key contraceptive step—if fertilization is prevented, there is no blastocyst to implant. The spermicidal effect that prevents fertilization is the major reason for the copper IUD's high efficacy. Therefore, while it prevents implantation, this action is a secondary line of defense following its primary goal of blocking fertilization.

The incorrect option is 4: Gametogenesis

Gametogenesis is the biological process by which diploid precursor cells undergo cell division and differentiation to form mature haploid gametes—sperm (spermatogenesis) and ova (oogenesis). This complex process occurs entirely within the gonads (testes for sperm and ovaries for ova). The Copper-T is a localized contraceptive device placed in the uterus, and its effects are local or limited to the passage of gametes. It does not contain any hormones or substances that travel through the bloodstream to affect the systemic production or maturation of eggs or sperm within the ovaries or testes. Therefore, gamete formation proceeds completely unaffected in both the male and female partners.