Question

Diaphragms, cervical caps and vaults prevent conception by

• A. Increasing phagocytosis of sperms within uterus
  
• B. Inhibiting ovulation and implantation
  
• C. Suppressing sperm motility
  
• D. Blocking the entry of sperms through the cervix
  

Answer 1

The correct option is D Blocking the entry of sperms through the cervix


Barrier methods :
Barrier contraceptive methods prevent the physical meeting of sperm and ovum.
Examples: Condoms, diaphragms, spermicidal creams, vaults, cervical caps etc.

Mechanism of barrier methods :
Diaphragms, cervical caps and vaults are barrier methods that are inserted into the female reproductive tract such as the cervix to cover the cervix and acts as a barrier to prevent the entry of sperms into the female reproductive tract during coitus.

Mechanism of Intrauterine devices :
Cu releasing IUDs can be used for a long time period and are the ideal contraceptives for spacing between the children.
They release copper ions in the uterus where they suppress the motility of sperms so that they cannot swim and reach the fallopian tube for fertilisation.

Mechanism of oral contraceptive pills :
Oral contraceptives work either by delaying ovulation (release of secondary oocytes) or if ovulation has already occurred, then it works by preventing fertilisation.

Final answer:
(D) Blocking the entry of sperms through the cervix