Physioex 8 Exercise 7
Activity 2: Measuring Normal Respiratory Volumes
1. Minute respiratory volume: 7,500 ml
2. Judging from the trace you generated, each inspiration took place over how many seconds? 2 Seconds
3. Each expiration took place over how many seconds? 2 seconds
4. Does the duration of inspiration or expiration vary when you tested/measured the ERV or FVC? Yes
Activity 3: Effect of Restricted Air Flow on Respiratory Volumes
1. How does this set of data compare to the data you recorded for Activity 2? The MRV is 3075 and the breathing is not as strong.
2. Is the respiratory system functioning better or worse than it did in the previous activity? Explain why. The breathing is more shallow and incomplete. The lungs were not able to inhale or exhale as much as in activity 2.
3. What does the air flow tube simulate in the human body? The trachea.
4. What could be some possible causes of reduction in air flow to the lungs? An allergic reaction could cause the trac to swell, restricting the flow of air. An obstruction could also block the trachea decreasing or blocking the air flow as well.
Factors Affecting Respiration
Activity 4: Effect of Surfactant on Respiratory Volumes
1. When surfactant is added, what happens to the tidal volume? It increases the amount of air being inhaled.
2. As a result of the tidal volume change, what happens to the flow into each lung and total air flow? They all increased.
3. Why does this happen? Surfactant acts to decrease the surface tension of water in the fluid that line the walls of the alveoli.
Activity 5: Effect of Thoracic Cavity Puncture
1. What happened to the left lung when you clicked on the valve button? It deflated.
2. Why? Because the pressure in the left lung was 0 and the right lung changed rapidly, the air moved into the intrapleural space through the opening, causing intrapleural pressure.
3. What has happened to the “Total Flow” rate? It was reduced by ½.