Unit 1: Humans and animals

Skeletons, bones and joints, how muscles move us, and how medicines help us when we are ill.

• 1.1 Skeletons – A hard, strong frame hides inside you.
• 1.2 The human skeleton – 206 bones, from your skull to your toes.
• 1.3 Why do we need a skeleton? – Support, protection and movement.
• 1.4 Skeletons and movement – Muscles pull bones – in pairs.
• 1.5 Drugs as medicines – Medicines help us – if we use them safely.
• 1.6 How medicines work – Killing germs, easing pain and stopping disease before it starts.