Blood

Blood

Red blood cell:

• Their job is to carry oxygen from the lungs to all the cells in the body.
• Their shape is biconcave disc, this gives large surface area for absorbing oxygen.
• They don't have a nucleus, this allows more room to carry oxygen.
• They contain a red pigment called haemoglobin.

White blood cell:

• Defend against infections.
• Some can change shape to gobble up unwelcome microorganisms, in…