Example 1 · difficulty 2/5
Compared with a non-medicated device such as the Lippes loop, a copper-releasing IUD like CuT offers added protection chiefly because the released copper ions:
- A. suppress FSH secretion and thereby prevent ovulation
- B. suppress sperm motility and the fertilising capacity of sperms
- C. permanently thicken the cervical mucus plug
- D. dissolve the zona pellucida surrounding the released ovum