To define the following terms: ventiliation, inspiration, expiration, forced expiration, tidal volume, expiratory reserve volume, inspiratory reserve volume, residual volume, vital capacity, forced expiratory volume, minute respiratory volume, surfactant, and pneumothorax.
To describe the role of muscles and volume changes in the mechanics of breathing.
To understand that the lungs do not contain muscle and that respirations are therefore caused by external forces.
To explore the effect of changing airway resistance on breathing.
To study the effect of surfactant on lung function.
To examine the factors that cause lung collapse.
To understand the effects of hyperventilation, rebreathing, and breath holding on the CO2 level …show more content…
FEV1 (%) will decrease as the airways radius is decreased. If the airway becomes smaller, then the resistance to airflow will increase and FEV1 (%).
Activity 3: Examining the Effect of Surfactant
How was the air flow changed with surfactant compared to the baseline run? FEV 1 (5) decreased as the radius of the airway is decreased. Airflow increases when surfactant is applied because resistance to lung inflation has been reduced.
Premature infants often have difficulty breathing. Explain why this might be so. Surfactant isn’t produced in premature infants and since it is needed for the lungs to inflate, it is not needed until after birth.
Activity 4: Investigating Intrapleural Pressure
What happened to the lung in the left side of the bell jar? The lung deflated and the pressure was zero in the left lung, but the pressure in the right lung changed multiple times.
How did the pressure in the left lung differ from that in the right lung?