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[Type here] [Type here] Structures and Function of Body Systems Lessons One: Levels of Organisation Kerboodle Pages 26 - 27 What is a multicellular organism? An organism made up of lots of cells. Put these levels of organisation in order starting with the smallest Cell, tissue, organ, system, organism Organ, cell, organism, tissue, system What is a tissue? What is an organ? What is a system? Lesson Two: Gas Exchange A group of cells that work together to perform a certain function A group of tissues that work together to perform a certain function A group of organs that work together to perform a certain function Kerboodle Pages 28-29 Name three organ systems Choose from: Circulatory Respiratory Reproductive Digestive Skeletal Muscular What is gas exchange? When you breathe in oxygen and breathe out carbon dioxide Label this diagram What happens in the alveolus? Oxygen diffuses into the blood What is respiration? A chemical reaction that releases energy Why can you see your breath when you breathe on We breathe out water that condenses on the a cloud mirror mirror Lesson Three: Breathing What happens when we breathe in? Kerboodle Pages 30 - 31 Ribs move up and out Diaphragm contracts – moves down Volume of the chest increases. Pressure decreases so gas rushes in. [Type here] What happens when we breathe out? What can increase lung volume? What can decrease lung volume? Lesson Four: Skeleton [Type here] Structures and Function of Body Systems Ribs move down and in. Diaphragm relaxes – moves up. Volume of the chest decreases. Pressure decreases so gas rushes out Exercise Smoking Lung diseases such as asthma Old age Kerboodle Pages 32-33 How do you keep your bones healthy? Exercise and a healthy diet. Give four functions of the skeleton Support the body Protect vital organs Helps the body move Makes blood In the bone marrow Where is your blood made? Lesson Five Movement: Joints Kerboodle Pages 34-35 State what a joint is. Where two or more bones join together. Name three types of joints. Hinge joints Ball and socket joints Fixed joints Cartilage covers the end of a bone and stops bones rubbing together. Ligaments hold bones together. State what cartilage is What do ligaments do? Lesson Six Movement: Muscles Why is a muscle a tissue? Why are muscles antagonistic? How do you bend your arm? Kerboodle Pages 36-37 Lots of muscles cells work together to cause movement. They work together but in the opposite directions. One muscle contracts and the other relaxes The bicep contracts and the triceps relaxes