A nurse is educating a 28-year-old female patient who wants to start using hormonal contraception. The patient asks, "How do birth control pills actually work to prevent pregnancy?" What is the nurse's best response?
- They suppress ovulation and thicken cervical mucus to prevent sperm penetration.
- They destroy sperm cells immediately upon contact with vaginal tissues.
- They create a barrier that physically blocks sperm from reaching the egg.
- They cause the uterine lining to shed monthly, preventing implantation only.