Your heart beats about 70 times a minute and pumps blood in a one-way path around your body.
The respiratory system is made up of a group of organs that help us breathe.
The reproductive systems are different for men and women. They work together so that we can reproduce.
Reproduction begins with fertilisation. This is when a sperm cell joins an ovum cell.
Pregnancy is the time when a fertilised ovum develops into a baby in the uterus. It lasts nine months.
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