Child development/care notes

Conception and fertilisation

A sperm is about 0.04 mm in length. It has a head, a nucleus, a middle piece and a tail. The tail helps the sperm swim and this is lost when it enters the ovum. Sperm lives in the body for 72 hours.

An egg is the largest human cell – it is about the size of a full stop. It has a jelly like coating to stop it from sticking to the sides of…