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level: Ventilation in mammals

Questions and Answers List

level questions: Ventilation in mammals

QuestionAnswer
Explain process of inspiration- external intercostal and diaphragm muscles contract - this causes the ribcage to move upwards and outwards and the diaphragm to flatten, increasing the volume of the thorax - the lung pressure decreases - this causes air to flow into the lungs
Is inspiration passive or active- it is an active process, meaning it requires energy
Explain process of expiration- the external intercostal and diaphragm muscles relax - the ribcage moves downwards and inwards and the diaphragm becomes curved again - the thorax volume decreases, causing the air pressure to increase - air is forced out of the lungs
Is expiration passive of active- normal expiration is passive, meaning it doesn't require energy - however, it can also be forced
Define tidal volumethe volume of air in each breath
Define vital capacitythe maximum volume of air that can be breathed in or out
Define breathing ratehow many breaths are taken per unit of time
Define oxygen uptakethe rate at which a person uses up oxygen (dm3min-1)
How does a spirometer work- when a person breathes in and out using a spirometer, the lid of the chamber moves up and down. - these movements are recored by a pen attached to the lid, creating a spirometer trace
What does the soda lime doit absorbs the carbon dioxide the subject breathed out