KEGS Biology Blog


Monday 21st January Section 1
January 21, 2013, 2:04 pm
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Spirometres

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Different elements of lung volume
– Tidal volume- the volume of air moved in and out of the lungs with each breath when you are at rest.
– Vital capacity- the largest volume of air that can be moved into and out of the lungs in any one breath.
– Residual volume- the volume of air which always remains in the lungs, even after the biggest possible exhalation.
– Dead space- the air in the bronchioles, bronchi and trachea.
– Inspiratory reserve volume- how much air can be inspired over and above the normal tidal volume when you take in a big breath.
– Expiratory reserve volume- how much air can be expired over and above the amount that is breathed in a tidal volume breath.

– These different elements of lung volume can be shown on a trace diagram.

Spirometer
– A spirometer consists of an oxygen-filled chamber which floats on a water tank. A person breathes from a mouthpiece attached to a tube connected to the chamber- breathing in removes oxygen from the chamber, which therefore sinks down. Breathing out pushes air into the chamber, which then floats up.

Safety precautions:
– Soda lime is used to remove carbon dioxide from the air in the chamber’s enclosed space.
– The chamber is filled with medical-grade oxygen.
– The tubes must be above the level of water.
– The person must wear a nose clip in order to make sure no air escapes from the nose/ensures that the experiment is valid.
– Always use a disposable mouthpiece to prevent the spread of diseases.
– The person who breathes into the mouthpiece must not suffer from asthma.

– If the spirometer experiment is carried out in different temperatures, the readings will change. For example, in hot temperatures gases expand, which results in different volumes of the gases.

Comment by sarahroche12

Comment by meganbpotter




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