cell types

cell types

1. red blood cells

   • red blood cells carry oxygen from the lungs to all the cells in the body
   • they havew a biconcave shape. this gives a large surface area for carrying oxygen
   • they dont have a nucleus this makes more room to carry oxygen

2. white blood cells

   • white blood cells defend you bady agtainst deseases
   • they do have a nucleus
   • they are able to change shape. this lets white blood cells surround unwanted germs like bacteria and degest them

3. sperm cells

   • sperm cells are made by males
   • sperm and egg cells can join together to make an embryo this is called fertilisation
     • embryo can grow into a child
   • a sperm cell are very small
   • it has a tail which can move this allows it to swim and find an egg to fertilies
   • its head contains enzymes. these are chemical that help it get into the egg so the sperm and egg can join
   • the nucleus contain genes from the father these will be passed onto the child

4. egg cells

   • egg cells are made by females
   • sperm and egg cells can join together to make an embryo this is called fertilisation
     • embryo can grow into a child
   • and egg cell is large and bulky becuase it doesnt need to move about. it just sits and waits for sperm to find it
   • it contains cytoplasm. this provides food for the embryo
   • the nucleus contains genes from the mother. these will be passed onto the child