1. The Respiratory system Adapted from Gillian Rowe

2. Learning out comes You will understand the process of inspiration and expiration Where and how gaseous exchange takes place How red blood cells pick up oxygen and give off carbon dioxide How the cardio-circulatory system links with the respiratory system

4. The lungs The respiratory system’s main task is to supply oxygen to the blood and getting rid of waste gases. Carbon dioxide is the primary gas that the blood gets rid of. The upper structures of the respiratory system are combined with the sensory organs of smell and taste and the digestive system http://www.youtube.com/watch?v=JrawNbjq91g

5. Breathing When you inhale (breathing in) your skeletal muscle and the diaphragm contract, which then enlarge the chest cavity and cause the lungs to draw in air. This creates a partial vacuum in the thoracic cavity, air passes through the nose, pharynx, larynx, trachea, and then into the two bronchi to the lungs. Oxygen and carbon dioxide pass between the blood and the air in the alveoli, which are at the end of the smallest bronchi. Oxygen diffuses from the inhaled air through the alveoli walls into the capillaries

6. Respiration http://www.youtube.com/watch?v=HiT621PrrO0 The lungs contain more than 300 million alveoli. When you exhale or breathe out, your skeletal muscles and diaphragm return to the relax position which decrease the size of the chest cavity and therefore pushes the air out of the lungs. The rib cage serves as a structural support and pleural membranes help provide lubrication for the respiratory organs so that they are not chaffed during respiration. The air we exhale contains 100 times more carbon dioxide than inhaled air. In a resting position a healthy individual will inhale and exhale approximately 16 times per minute

7. The diaphragm http://www.youtube.com/watch?v=hp- gCvW8PRY&feature=related http://www.youtube.com/watch?v=hp- gCvW8PRY&feature=related The muscles of the diaphragm allow for the expansion of the lungs when air is inhaled by pulling the lungs down and forward it also assists with emptying the lungs when air is exhaled by pushing the lungs up and back

8. How oxygen travels to the cells http://www.youtube.com/watch?v=WXOBJEXxNEo& feature=related http://www.youtube.com/watch?v=WXOBJEXxNEo& feature=related Blood contains red blood cells, they are red because they contain iron, iron in the blood is called Haem, this is known as haemoglobin, haemoglobin with oxygen attached to it is called oxyhaemoglobin, oxygenated red blood cells circulate through the body and give off their oxygen by diffusion. Deoxygenated blood cells then travel to the lungs to collect more oxygen

9. overview Oxygen rich air is drawn into the lungs, this travels into the alveoli Gaseous exchange takes place in the alveoli, deoxygenated red blood cells travel from the systemic circulation system, through the heart and into the Pulmonary artery, they then travel through the pulmonary capillary system and pick up oxygen and give off carbon dioxide The blood cells then travel through the pulmonary veins to the heart to be sent via the Aorta back to the systemic system to supply the cells with oxygen