PhysioEx Exercise 7 Activity 3

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SUNY Buffalo State College *

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313

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Chemistry

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Dec 6, 2023

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11/24/22, 5:07 PM PhysioEx Exercise 7 Activity 3 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex7/act3/ 1/6 PhysioEx Lab Report Exercise 7: Respiratory System Mechanics Activity 3: Effect of Surfactant and Intrapleural Pressure on Respiration Name: Chowdhury Nahiyan Date: 24 November 2022 Session ID: session-882604e5-672a-6bea-02bd-d7b8b354e1b3 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

11/24/22, 5:07 PM PhysioEx Exercise 7 Activity 3 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex7/act3/ 2/6 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 reinﬂate over several breaths. Why did the sequential additions of surfactant change this lung system? Your answer: The addition of more ﬂuid to the lungs increased the pressure in the lungs. Correct answer: 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

11/24/22, 5:07 PM PhysioEx Exercise 7 Activity 3 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex7/act3/ 3/6

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11/24/22, 5:07 PM PhysioEx Exercise 7 Activity 3 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex7/act3/ 4/6

11/24/22, 5:07 PM PhysioEx Exercise 7 Activity 3 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex7/act3/ 5/6 Post-lab Quiz Results You scored 75% by answering 3 out of 4 questions correctly. Review Sheet Results The addition of surfactant to the lung interior Your answer: increased surface tension. Correct answer: increased airﬂow. 1 Opening the valve in the side of the glass bell jar You correctly answered: simulated pneumothorax. 2 In this activity a pneumothorax is automatically followed by You correctly answered: atelectasis. 3 The best way to rapidly reinﬂate a person's collapsed lung is to You correctly answered: pump air out of the intrapleural space to recreate negative pressure. 4 What effect does the addition of surfactant have on the airﬂow? How well did the results compare with your prediction? Your answer: yes. 1 Why does surfactant affect airﬂow in this manner? Your answer: 2

11/24/22, 5:07 PM PhysioEx Exercise 7 Activity 3 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex7/act3/ 6/6 it prevents the collapsing of the lungs. What effect did opening the valve have on the left lung? Why does this happen? Your answer: atelecsis. 3 What effect on the collapsed lung in the left side of the glass bell jar did you observe when you closed the valve? How well did the results compare with your prediction? Your answer: no it did not. 4 What emergency medical condition does opening the left valve simulate? Your answer: Penumothroax ( atelecsis ). 5 In the last part of this activity, you selected 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? Your answer: good. 6 What do you think would happen when the valve is opened if the two lungs were in a single large cavity rather than separate cavities? Your answer: both would collapse. 7

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