1. What effect does the addition of surfactant have on airflow? How well did the

Question

1. What effect does the addition of surfactant have on airflow? How well did the results compare with your prediction?

2. Why does surfactant affect airflow in this manner?

3. What effect did opening the valve on the left lung? Why does this happen?

4. What effect on the collapsed lung on the left side of the glass bell jar did you observe when you closed the valve? How ell did the results compare with your prediction?

5. What emergency medical condition does opening the valve simulate?

6. In the last part of this activity you clicked the Reset button to draw the air out of the intrapleural space and return the lung to its normal resting condition. What emergency procedure would be used to achieve this result if these were the lungs in a living person?

7. What do you think would happen when the valve is opened if the two lungs were in a a single large cavity rather than separate cavities?

Explanation / Answer

2)HYDROSTATIC PRESSURE IN PULMONARY CAPILLARY IS 8 TO 10 mmHg AND ONCOTIC PRESSURE OF 20 mmHg.THIS CAUSES AN INWARDLY DIRECTED PRESSURE OF 15 TO 17 mmHg.THUS LOW PULMONARY PRESSURE ALLOWS THE FLUID TO FLOW FRON ALVEOLI TO PULMONARY CAPPILARIES AND KEEPS THE SURFACE FREE FROM FLUID. HIGH SURFACE TENSION CAN CAUSE ACCUMULATION OF FLUID IN ALVEOLAR SPACE BUT DUE TO SURFACTANT THE SUFACE TENSION IS REDUCED.

THE OPENING OF LEFT LUNG VALVE WILL CAUSE THE COLLAPSING OF LEFT LUNG BECAUSE INTRAPLEURAL PRESSURE AND ATMOSPHERIC PRESSURE WILL BECOME SAME.

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