SKELETON & MOVEMENT Your skeleton; Supports your body. Allows you to move Protects delicate organs. Blood cells are made in the marrow

Skeletons Animals with backbones are called vertebrates and have internal skeletons called endoskeletons. Animals like lobsters and insects, which are invertebrates, do not have a backbone, they have a tough outer skeleton called an exoskeleton. Interesting facts  Jellyfish are supported by the water around them. Earthworms are supported by water inside their bodies.

Human Skeleton 206 bones Some bones are hollow in the middle and contain marrow. Adult Skeleton weighs about 9Kg Bone is a mixture of living material and non-living material. Living part contains cells and collagen (allows the bones to be flexible) Non-living part is made up of mineral salts – e.g. calcium phosphate (makes the bone hard). Bone growth takes place in childhood and adolescence. Growth takes place at the end of a bone.

Different Skeletons Can you identify the skeleton of; A pelican? A frog? A human? A dog? Are some things the same in each? Are some things different in each?

Skeleton & Movement There are over 200 bones in the human body. The bones are joined by LIGAMENTS The bones are rigid, but movement is possible because of JOINTS. There are different types of joints. A joint moves when MUSCLES pull on a bone Each muscle is attached to a bone by TENDONS

Ligaments & Tendons. Ligaments & tendons are made of strong fibres. They do not easily stretch but too great a force can result in injury. Find your ACHILLES tendon! Put your hand on the back of your ankle. Move you foot up and down. Feel for the bones & muscle, between them you should be able to feel a ‘string’. This is the ACHILLES TENDON.

MUSCLES Muscles move the bones at the joint. A tendon connects the muscle to the bone. Muscles CONTRACT (get shorter and pull on the bone.) Muscles work in ANTAGONISTIC pairs