Breath

Respiratory Air Flow and Volume - Physiology 2015

Answer

Comments for the Tutor about contribution of all students (e.g. if not all students could login together)

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Exercise 1: Lung volumes and capacities

Using the Horizontal Compression buttons and the scroll bar, display the section of data to include in your

report that matches the values in the table below .

On page 6 you were meant to have clicked on this link and use the calculator to determine the predicted

value for Residual Volume (RV). The table then automatically calculates the predicted values for vital capacity

(VC), functional residual capacity (FRC) and total lung capacity (TLC).

The predicted values are based on the Goldman and Becklake equations for Pulmonary Function (cited from

the John Hopkins Pulmonary Laboratory)

3 Marks for a correctly completed table above.

Study Questions

1. Comment on the differences between the experimental and predicted values for VC, FRC and TLC in the table

above. What could cause these differences, if any? If your values do not differ, then speculate on possible

reasons why in some cases there may be differences. (4 Marks)

Answer

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2. In quiet breathing, muscular effort is used mainly in inspiration, and expiration is largely passive, due to

elastic recoil of the lung. Can you relate this fact to the pattern of expiratory and inspiratory flow? ( 2 Marks)

Answer

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3. Describe what the term RV represents in terms of respiratory volumes and explain why RV cannot be

determined by ordinary spirometry? (3 Marks)

Answer

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Exercise 2: Pulmonary function tests

Using the Horizontal Compression controls and the scroll bar, display the relevant data to include in your report.

2 Marks for a correctly completed table.

Study Questions

4. In your own words describe the physiological significance of the FEV1/FVC ratio? (3 Marks)

Answer

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5. From your physiological knowledge of the types of...