Lung volumes and capacities DATA Table 1 Class average (Male) Volume measurement

Question

Lung volumes and capacities DATA Table 1 Class average (Male) Volume measurement Individual (L) Class average (Female) Tidal Volume (TV) Inspiratory Reserve (RV)5 Expiratory Reserve 3.7 (ERV) Vital Capacity (VC) Residual Volume (RV) Total Lung Capacity 1.5 1.5 (TLC) DATA ANALYSIS I. What was your Tidal Volume (TV)? What would you expect your TV to be if you inhaled a foreign object which completely obstructed your right primary Describe the difference between lung volumes for males and females. What might account for this? 2. 3. Calculate your Respiratory Minute Volume (RMV) at rest. (TV (ml/breath) × RR (breaths/minute))-RMV (mlmin) If you are taking shallow breaths (TV-0.20 L) to avoid severe pain from rib fractures, what respiratory rate will be required to achieve the same minute volume? 45

Explanation / Answer

1. Tidal Volume was 0.2 L. If a foreign object is inhaled which completely obstructed the right mainstream bronchus then the Tidal Volume is expected to be half of that of the normal Tidal Volume because the right part of the bronchus cannot be counted. So, the Tidal Volume now = 0.1 L

2. The lung capacity of males is higher than females due to the overall larger body size of men and presence of more muscles compared to women.

3. Tidal Volume(TV) = 0.2 L / minute

Respiratory Rate = 14 beats / minute

So,

Minute Volume at Rest = ( 0.2 L / minute ) * ( 14 beats / minute ) = 2.8 L

If a person takes shallow breaths then the breathing rate will increase and the Tidal Volume will decrease.

4. Exposure to occupational hazards like dust, silica etc. leads to scarring of lung tissue and fibrosis. This makes the lungs stiff and recoil. This condition causes a problem in the expansion of lungs so the TLc and VC both decreases and the breathing rate increases.

5. A person suffering from emphysema is not able to exhale the air in the lungs properly. So, this leads to a decrease in VC. Now, the air which the person is unable to release increases the Residual Volume of and therefore the TLC remains unaffected that is the TLC remains same.

6. When we are treading water in a lake we are putting much more effort than normal so the body requires more oxygen due to the strain put on the body. Since more oxygen is required it means that the breathing rate increases. This leads to an increase in the Expiratory Reserve Volume

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