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Measuring Lung Capacity. Learning Intentions Explain the meaning of the terms tidal volume and vital capacity. Describe how a spirometer can be used to.

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Presentation on theme: "Measuring Lung Capacity. Learning Intentions Explain the meaning of the terms tidal volume and vital capacity. Describe how a spirometer can be used to."— Presentation transcript:

1 Measuring Lung Capacity

2 Learning Intentions Explain the meaning of the terms tidal volume and vital capacity. Describe how a spirometer can be used to measure vital capacity, tidal volume, breathing rate and oxygen uptake. Analyse and interpret data from a spirometer.

3 Vital Capacity Is the maximum volume of air that a person can breathe in or out in one breath.

4 Tidal volume is the volume of air breathed in or out of the lungs in one normal breath at rest.

5 Spirometer Is a high-tech piece of equipment used to measure vital capacity, tidal volume, breathing rate and oxygen uptake.

6 Spirometer A spirometer consists of a chamber filled with oxygen on a tank of water. A person breaths in the oxygen from the tank causing the lid to sink. Breathing out causes the lid to float up The movement of the chamber is recorded using a data logger so that a spirometer trace can be produced.

7 Spirometer Trace

8 Explanation of the trace Residual volume: is the volume of air that always remains in the lungs even after the biggest exhalation Dead space: is the air in the bronchioles, bronchi and trachea. There is no gas exchange between this air and the blood. Inspiratory reserve volume: is how much more air can be breathed in over and above the normal tidal volume. You use this when exercising. Expiratory reserve volume: Is how much more air can be breathed out over and above the normal tidal volume.

9 Interpreting a spirometer trace MeasurementMaleFemale Tidal Volume dm 3 Vital Capacity dm 3 Breathing rate breaths/min Oxygen uptake dm 3 /s Answer the questions on the worksheet

10 Plenary


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