Knowing the boy bits from the girl bits
The male sex cell, sperm, is produced in the testes. Testes hang from the body in the scrotum, which regulates the temperature of the sperm. Sperm travel from the testes through the vas deferens where it is combined with fluids produced from the seminal vesicle and prostate gland to produce semen. Semen will then travel through the urethra and be ejaculated from the penis.
Women are born with approximately 400 000 eggs (ova) that are made within the ovaries. When a female becomes sexually mature, she will release an ovum once a month. During fertilisation, a male sperm will meet the ova in the fallopian tubes.
Key parts of the female anatomy:
- Fallopian Tubes
Reproduction and Fertilisation
As you are already aware, cells divide. This also occurs following fertilisation where the zygote (the fertilised ovum) divides and can potentially divide the embryo. As a result, two identical offspring are produced. If the mother has released more than one egg (as can happen) fraternal twins are produced.
- Identical twins: the one released egg and enbryo divides
- Fraternal twins: two (or more) eggs are released and fertilised