Functions of the parts of an egg

Shell membranes (inner and outer)

acts as filters to keep the egg in good condition

Yolk

carries most nutrients and all vitamins

Shell

prevents damage to egg and shields it against bacteria

vitelline membrane

surrounds the yolk and holds it together

Germinal Disc

Becomes a chick if the egg is fertilized

White or Albumen

Make up 60% of the egg. There are two types of white, the thick white stands up and the thin white runs towards the edge.

Chalazae

Membranes that hold an egg yolk in place

Air Cell

Pocket of air formed at large end of egg, as the egg ages, it loses water and air is drawn in to replace it so the air pocket gets larger