PhysioEx Exercise 7 Activity 3

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PhysioEx Lab Report Exercise 7: Respiratory System Mechanics Activity 3: Effect of Surfactant and Intrapleural Pressure on Respiration Name: Corra Clawson Date: 4 December 2023 Session ID: session-6bd490cc-3bc6-adc7-9dc7-221d22e2714a Pre-lab Quiz Results You scored 100% by answering 5 out of 5 questions correctly. Experiment Results Predict Questions Which of the following statements about surface tension is false ? You correctly answered: Surface tension acts to increase the size of the alveoli within the lungs. 1 Which of the following statements about surfactant is false ? You correctly answered: Surfactant works by increasing the attraction of water molecules to each other. 2 Just before an inspiration begins, the pressure within the intrapleural cavity You correctly answered: is less than the pressure within the alveoli. 3 The respiratory condition of pneumothorax refers to You correctly answered: any opening that equalizes the intrapleural pressure with the atmospheric pressure. 4 A pneumothorax can lead to You correctly answered: atelectasis. 5 Predict Question 1: What effect will adding more surfactant have on these lungs? Your answer: Airflows will further increase. 1 Predict Question 2: What will happen to the collapsed lung in the left side of the glass bell jar if you close the valve? 2
Stop & Think Questions Experiment Data Airway Radius (mm) Breath Rate (breath/min) Surfactant Pressure Left (atms) Pressure Right (atms) Flow Left (ml/min) Flow Right (ml/min) Total Flow (ml/min) 5 15 0 -4.00 -4.00 49.69 49.69 99.38 5 15 2 -4.00 -4.00 69.56 69.56 139.13 5 15 4 -4.00 -4.00 89.44 89.44 178.88 5 15 0 -4.00 -4.00 49.69 49.69 99.38 5 15 0 0.00 -4.00 0.00 49.69 49.69 5 15 0 0.00 -4.00 0.00 49.69 49.69 5 15 0 -4.00 -4.00 49.69 49.69 99.38 Your answer: The lung will remain collapsed. Why did the sequential additions of surfactant change this lung system? You correctly answered: Surface tension was sequentially decreased. 1 Premature infants often have difficulty breathing because the amount of surfactant in their lungs is You correctly answered: too low. 2 What happened to the left side of the bell jar when the valve was opened? You correctly answered: The intrapleural pressure equalized with the atmospheric pressure. 3 Did the collapsed left lung reinflate? You correctly answered: No, it did not. 4
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