Year 9 Science Transition - Autumn PDF

SCIENCE Sports Year 9 Unit 1 Physiotherapis t Alveoli are the tiny air sacs found at the end o...

SCIENCE Sports Year 9 Unit 1 Physiotherapis t Alveoli are the tiny air sacs found at the end of bronchioles in your lungs. Gas exchange occurs here. Oxygen moves into the blood and carbon dioxide is removed. Alveoli have the following key features to maximise gas exchange: A huge combined surface area Moist, thin walls to maximise diffusion of oxygen and carbon dioxide Millions of tiny blood vessels called capillaries just behind these walls. Part of the gas exchange Function system This is also called the windpipe. This tube runs from the mouth, down the throat towards the lungs. Trachea It is lined with rings of cartilage which keep it open at all times. Bronchus The trachea splits into a left and right bronchus (plural: bronchi), each leads to a lung. Each bronchus splits again and again into thousands of smaller tubes called bronchioles which take Bronchiole the air deeper into the lungs. At the ends of bronchioles are tiny air sacs called alveoli. Here oxygen moves into the blood and Alveoli carbon dioxide moves out. Intercostal These muscles run between the ribs and form the chest wall. They contract and relax with the muscles diaphragm when a person breathes. The diaphragm is a dome-shaped, flat sheet of muscle under the lungs. It contracts and relaxes Diaphragm with the intercostal muscles during breathing.  SCIENCE Sports Year 9 Unit 1 Physiotherapis t  SCIENCE Year 9 Unit 2 Electrical Engineer  SCIENCE Energy Year 9 Unit 2 Consultant Simple machines  SCIENCE Year 9 Transition Biology Unit 1  SCIENCE Chemistry Unit Year 9 Transition 1  SCIENCE Year 9 Transition Physics Unit 1