Physioex Exercise 7

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EXERCISE 7: RESPIRATORY SYSTEM MECHANICS

ACTIVITY 1: Measuring Respiratory Volumes and Calculating Capacities | Answers | 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. 300 b. 500 c. 1000 d. 1500 | B-500 | 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. | TRUE | 1. The changing of the airway radius in this lab simulation represents changing the size of the a. Nose and mouth b. Pharynx c. Trachea d. Primary bronchi, secondary bronchi, other bronchi and bronchioles | C-Trachea | 1. When the airway radius was decreased to 4.00 mm, the airflow changed to _______ L/minute and the FEV1 changed to ________ ml. | 3.075L/1422ml | 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? | Coughing | 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? | 74% | 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

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