The Human gas-exchange system All Most Some What are the functions of its main parts? How is the human gas-exchange system arranged? First 15, run through answers to exam What are the main features of the human gas-exchange system?

Today we are covering from the specification: Pages 74 & 75 of your textbook

Write each of these key words on an individual post it Trachea Rings of cartilage Right lung Bronchus Bronchioles Ribs Intercostal muscle Larynx Pleural membrane Diaphragm Pleural cavity fluid Sternum Internal intercostal muscles External intercostal muscles Clavicle

Recap from GCSE Answer the following questions in your folder: What is taken in by the lungs? Which substance is absorbed at the interface between capillaries and the lungs? Why do we require this substance? Air is taken into the lungs. Oxygen is absorbed into the blood from the lungs. Oxygen is required for respiration and the release of energy in the form of ATP.

Starter – recap from GCSE Air is taken into the lungs. Oxygen is absorbed into the blood from the lungs. Oxygen is required for respiration and the release of energy in the form of ATP. 25 min into lesson

Lungs, why do we have them, why do we need them? All aerobic organisms require a constant supply of oxygen for respiration and the release of ATP from glucose. The gas-exchange system in humans is a two-way process, as CO2 needs to be removed. The build up of CO2 in the body could be harmful.

Lungs, why do we have them, why do we need them? The volume of oxygen that has to be absorbed (and the volume of CO2 that has to be removed) is large in mammals because.....

Lungs, why do we have them, why do we need them? They are relatively large organisms with a large volume of living cells. They maintain high body temperature and therefore have high metabolic and respiratory rates.

Lungs, why do we have them, why do we need them? As a result, all mammals have evolved specialised surfaces, called lungs, to ensure efficient gas exchange between the air and their blood. 30min into lesson

Lung structure & Function

The gross structure of the lung Pluck demo – don’t pump up at this point, just point out the macular structure of the lungs, the lobes and trachea etc. 40min into lesson.

Task – 7 minutes Read page 75 of your textbook. Answer questions 1, 2 & 3 in the orange box. Remember to use full sentences. Plenary task – then run through answers to check understanding.

Challenge! Try to label as much as you can from memory. There is no #4! 50min into lesson Nostril/nasal opening. Nasal cavity. Pharynx. Epiglottis. Larynx. Oesophagus. Trachea. Lung. Pleural membrane. Bronchus. Bronchioles. Diaphragm. Alveoli. Branch of pulmonary vein and pulmonary artery. Alveolar capillaries. Terminal bronchiole. Alveolus.