EXERCISE 7: RESPIRATORY SYSTEM MECHANICS
ACTIVITY 1: Measuring Respiratory Volumes and Calculating Capacities
| 1. Which of the following processes does not occur during inspiration? a.
The diaphragm moves to a flattened position. b.
Gas pressure inside the lungs is lowered. c.
Inspiratory muscles relax. d.
The size of the thoracic cavity increases.
| C-Inspiratory muscles relax.
| 1. During normal quiet breathing, about ______ ml of air moves into and out of the lungs with each breath. a.
| 1. True or False: At the beginning of expiration, the air pressure of the atmosphere decreases so that air can flow from the lungs outward.
| 1. The changing of the airway radius in this lab simulation represents changing the size of the a.
Nose and mouth b.
Primary bronchi, secondary bronchi, other bronchi and bronchioles
| 1. When the airway radius was decreased to 4.00 mm, the airflow changed to _______ L/minute and the FEV1 changed to ________ ml.
| 1. If the TV of a person’s lungs is 600ml, the ERV is 1200ml, the RV is 1200ml, and the IRV is 3000 ml, the total lung capacity (TLC) is _______ ml.
| TLC= 6000ml
| 1. What would be an example of an everyday respiratory event the ERV simulates?
| 1. What additional skeletal muscles are utilized in an ERV activity?
| In forced expiration, abdominal-wall muscles and the internal intercostal muscles contract.
| 1. What was the FEV1% at the original radius of 5.00 mm?
| 1. What happened to the FEV1% as the radius of the airways decreased?
| FEV1 (%) decreased as the airway radius was decreased.
| 1. Explain why the results from the experiment suggest that there is an obstructive, rather than a restrictive, lung problem?
| The FEV1 (%) decreased proportionally as the radius decreased which is characteristic of...
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