Reproduction

• men reproductive organs:

  glands-produces a fluid that helps transport the sperm safely and protects the sperm
• men reproductive organs:

  sperm duct-helps the sperm to get out of the male body
• men reproductive organs:

  penis and urethra- it's used to pass urine and semen out of the man's body
• men reproductive organs:

  testes- they produce sperm and male hormones
• female reproductive organs:

  ovaries- where the egg cells are stored
• female reproductive organs:

  oviduct/fallopian tube-helps the egg transfer from the ovaries to the uterus.
• female reproduction organs:

  uterus-where the foetus develops until it's birth
• female reproduction organs:

  cervix: is a ring of muscle at the lower end of the uterus, keeps the baby in place while the woman is pregnant
• female reproductive organs:

  vagina: leads from the cervix to the outside of the female body and it's where the mans penis goes during sexual intercourse
• sperm adaptations:

  streamlined body-which allows it to move rapidly to reach the egg
• sperm adaptations:

  tight packed mitochondria-source of energy for swimming to the egg
• sperm adaptations:

  long tail-allows it to swim faster to reach the egg
• sperm adaptations:

  sack of acid- helps to break down the egg faster
• fertilisation:

  the sperm is ejaculated into the vagina by the penis and the sperm go towards the ovaries looking for the egg.
• fertilisation:

  After the sperm enters and fertilises the egg, it starts to move along the oviduct to the uterus where the cilia hairs help it to move along.
• fertilisation:

  then the egg embeds itself into the uterus lining and starts to grow and now is called and embryo.
• fertilisation:

  after 9 weeks the embryo is now called a foetus
• development of offspring:

  egg --> embryo --> foetus
• egg adaptations:

  the egg cell's cytoplasm- it contain nutrients for the growth of the embryo.
• egg adaptations:

  the cell membrane- it changes after fertilisation by a single sperm so hat no more sperm can enter the body