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Exercise 7: Respiratory System Mechanics: Activity 1: Measuring Respiratory Volumes and Calculating Capacities Lab
Report
Pre-lab Quiz Results
You scored 100% by answering 5 out of 5 questions correctly.
1.
Which of the following statements describing the mechanics of breathing is
false
?
You correctly answered: d. Ventilation relies exclusively on contracting skeletal muscles.
2.
The contraction of which of the following muscles will increase the thoracic cavity volume during inspiration?
You correctly answered: c. the external intercostals
3.
At the beginning of inspiration, the
You correctly answered: b. thoracic cavity volume increases.
4.
At the beginning of expiration, the
You correctly answered: a. pressure in the thoracic cavity increases.
5.
A tidal volume refers to the
You correctly answered: b. amount of air inspired and then expired with each breath under resting conditions.
11/13/19
page 1
11/13/19
page 2
Experiment Results
Predict Question:
Predict Question:
Lung diseases are often classified as obstructive or restrictive. An
obstructive
disease affects
airflow
,
and a
restrictive
disease usually reduces
volumes and capacities
. Although they are not diagnostic, pulmonary function
tests such as forced expiratory volume
(FEV1) can help a clinician determine the difference between obstructive and
restrictive diseases. Specifically, an
FEV1 is the forced volume expired in 1 second.
In obstructive diseases such as chronic bronchitis and asthma, airway radius is decreased. Thus,
FEV1 will
Your answer : a. decrease proportionately.
Stop & Think Questions:
Which muscles contract during quiet expiration?
You correctly answered: d. None of these muscles contract during quiet expiration.
6.
Minute ventilation
is the amount of air that flows into and then out of the lungs in a minute. Minute ventilation (ml/min) =
TV (ml/breath) x BPM (breaths/min).
Using the values from the second recorded measurement, enter the minute ventilation in the field below and then click
Submit Data
to record your answer in the lab report.
You answered: 7500 ml/min
11. A useful way to express FEV1 is as a percentage of the forced vital capacity (FVC). Using the FEV1 and FVC values
from the data grid, calculate the FEV1 (%) by dividing the FEV1 volume by the FVC volume (in this case, the VC is equal to
the FVC) and multiply by 100%.
Enter the FEV1 (%) for an airway radius of 5.00 mm in the field below and then click
Submit Data
to record your answer in
the lab report.
You answered: 74
12. A useful way to express FEV1 is as a percentage of the forced vital capacity (FVC). Using the FEV1 and FVC values
from the data grid, calculate the FEV1 (%) by dividing the FEV1 volume by the FVC volume (in this case, the VC is equal to
the FVC) and multiply by 100%.
Enter the FEV1 (%) for an airway radius of 3.00 mm in the field below and then click
Submit Data
to record your answer in
the lab report.
You answered: 70
Experiment Data:
Radius
Flow
(L/min)
TV
ERV
IRV
RV
VC
FEV1
TLC
Breath Rate
5.00
7485
499
---
---
---
---
---
---
15
5.00
7500
500
1200
3091
1200
4791
3541
5991
15
4.50
4920
328
787
2028
1613
3143
2303
4756
15
4.00
3075
205
492
1266
1908
1962
1422
3871
15
3.50
1800
120
288
742
2112
1150
822
3262
15
3.00
975
65
156
401
2244
621
436
2865
15
11/13/19
page 3
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11/13/19
page 4
11/13/19
page 5
Post-lab Quiz Results
You scored 100% by answering 5 out of 5 questions correctly.
1.
To calculate a person's vital capacity, you need to know the TV, ERV, and
You correctly answered: c. IRV.
2.
Measuring a person's FVC means that you are measuring
You correctly answered: d. the amount of air that can be expelled when the subject takes the deepest possible inspiration
and then forcefully expires as completely and rapidly as possible.
3.
Measuring a person's FEV1 means that you are measuring
You correctly answered: b. the amount of the VC that is expired during the first second of the FVC test.
4.
For a person suffering an asthma attack, inhaler medications are expected to
You correctly answered: a. reduce the airway resistance.
5.
Which of the following values does
not
include the ERV?
You correctly answered: c. TV
11/13/19
page 6
Review Sheet Results
1.
What would be an example of an everyday respiratory event the ERV simulates?
Your answer:
An example of an everyday respiratory event that simulates ERV would be forced expiration.
2.
What additional skeletal muscles are utilized in an ERV activity?
Your answer:
The additional skeletal muscles that are utilized in an ERV activity are abdominal muscles and the internal intercostal
muscles contract.
3.
What was the FEV1 (%) at the initial radius of 5.00 mm?
Your answer:
The FEV percentge of the 5.00 radius is 73.9%.
4.
What happened to the FEV1 (%) as the radius of the airways decreased? How well did the results compare with your
prediction?
Your answer:
During the expirement I though that the FEV would decrease proportionately and this held true during the duration of the
expirements.
5.
Explain why the results from the experiment suggest that there is an obstructive, rather than a restrictive, pulmonary
problem.
Your answer:
In an obstructive situation, the radius would decrease and as the radius decresed, FEV1 decreased.
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Figure
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E
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