BY5.2 Sexual Intercourse, Fertilisation and Implantation

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Sexual Intercourse:

  • penis becomes erects as blood under pressure fills the erectile tissue
  • ****** widens and becomes lubricaed by the secreion of mucus
  • movements of the penis results in eaculation of ***** into ******
  • some ***** ejeaculated trhough cervix and into ******, rest is at the top of the ******
  • sperm swins through the uterus and into the fallopian tube by lashings of their tail
  • only a small portion (hundreds) of 400 million sperm reach the site of fertilisation and surround the ovum

Fertilisation:

  • internal fertilisation - sperm is deposited into the female reproductive tract and swim trhough the cervix, up the uterus and into the fallopian tube
  • sperm are vibale for 48 hours
  • ova are viable for 24 hours
  • if ovulation recently occured, the secondary ocyte is in the fallopian tube
  • the secondary oocyte is surrounded by follicle cells and a clear membrane called the zona pellucida
  • several hundred dpern surround it but only one will penetrate the egg
  • sperm fuse with the egg and a diploid gamete…

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