The skeletonal system is a network of bones which are surrounded by soft tissue that allows our bodies an amazing range of movement.
Muscles are made up of bundles of fibres that glide over each other and contract to generate movement.
Muscles are attached to bones by tendons and bones are attached to each other by ligaments.
Muscle fibres only work in one direction - meaning they contract to shorten themselves by cannot extend. Thats why about the body, muscles are arranged in opposing pairs so that as one contracts the other expands to allow movement in all directions.
The circulatory system consists of heart, lungs, arteries and blood which allows oxygen to be transported around the body to keep cell alive.
Our bodies are made up of thousands of cells and every one of them needs a regular supply of blood.
Blood brings all the ingredients the cells need for growth, nutrition and repair; it also takes away the waste products and toxins.
The nervous system keeps the brain informed of what's going on and allows us to think, act and feel.
Our digestive system helps us to absorb energy from food and keeps us hydrated with water.
The immune system prevents attacks from viruses, bacteria and other micro-organisms that could cause us harm or spread disease.
The skin is the body's largest organ.
