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Breathe: do steps 1,2,3 and 4 Come in and find which table has your name Take your coat, hat, scarf off and sit down quietly Stop talking, making noises and listen During the lesson, speak only when I ask a question or when I ask you to work with a partner or in a group. Warnings will be given for ANY disruptive behaviour Rewards will be given for POSITIVE contributions
Objectives Understand what the cardio-respiratory system is Label the pathway airs takes from the nose to the lungs Describe gas exchange and where it takes place Describe what happens when we Breath in (inspiration) Breath out (expiration)
The Cardiac System (The Heart) The Respiratory System (The Lungs) The Cardio - RespiratorySystem (The Heart AND the Lungs working together)
Capillaries Capillaries Muscle The Cardio-Respiratory System Aorta Veins Arteries Vena Cavae O2 CO2 Venules Arterioles
The Respiratory System Structure Mouth Epiglottis Trachea Bronchus Lung
Structure of the lung Trachea Bronchus Bronchioles Alveoli
Muscles involved in breathing Diaphragm A domed shaped muscle at the bottom lungs and ribs Intercostals Muscles found in between each rib to help them move
How do we make space for the O2 coming in? Air is sucked down the wind pipe and into the lungs The intercostal muscles contract, allowing rib cage moves upwards and outwards. The lungs expand to allow more air in The diaphragm contracts and pulls down to make the chest larger INSPIRATION (breathing in)
How do we force the CO2 back out again? When we breath out we squeeze the carbon dioxide out The lungs are compressed, pushing air out of the lungs and up the windpipe Intercostal muscles relax, lowering the rib cage and making the chest smaller The diaphragm also relaxes to make the chest smaller Video: muscles involved in inspiration and expiration EXPIRATION (breathing out)
Breathing in and out ... Breathing in … is hard work therefore we CONTRACT Breathing out … is easy therefore we RELAX Try it now … listen to this track and breathe in and out Can you see your body creating space for the oxygen when you breathe in?