Breathing ~ The Human Lungs {EXPIRATION - breathing out} 5.0 / 5 based on 1 rating ? BiologyHuman, animal and plant physiologyASAQA Created by: emilyowlCreated on: 14-04-16 10:09 What is expiration? The largely active process, which means that is doesn't require much energy, process of breathing out. 1 of 10 What do the internal intercostal muscles and the external intercostal muscles do during expiration? The internal intercostal muscles contract and the external intercostal muscles relax. 2 of 10 What movement happens to the ribs during expiration? The ribs move downwards and inwards. 3 of 10 What happens to the volume of the thorax during expiration? The volume of the thorax decreases. 4 of 10 What happens to the diaphragm during expiration? And why? The diaphragm relaxes and is pushed upwards by the contents of the abdomen that was compressed during inspiration. 5 of 10 What happens as a result of the volume of the thorax during expiration? The decreased volume of the thorax increases the pressure of the lungs. 6 of 10 Compare the pressure in the atmosphere and in the lungs during expiration. The atmospheric pressure is lower than the pulmonary pressure in the lungs. 7 of 10 What happens as a result of the different pressures in expiration? Air is forced out of the lungs into the atmospheric air. 8 of 10 How is air got out of the lungs during normal/quiet breathing? The recoil of the elastic tissue in the lungs is the main cause of air being forced out. 9 of 10 How does air leave the lungs during strenuous breathing (during exercise)? Some other various muscles play a major part. 10 of 10
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