PhysioEx Exercise 7 Activity 3

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Augusta Technical College *

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2114

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Chemistry

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Dec 6, 2023

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pdf

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10/16/23, 11:26 AM 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: Nicole Fohrman Date: 16 October 2023 Session ID: session-1c126fc1-8d46-baf5-c476-625dc44edd07 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

10/16/23, 11:26 AM 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 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

10/16/23, 11:26 AM PhysioEx Exercise 7 Activity 3 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex7/act3/ 3/6

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10/16/23, 11:26 AM PhysioEx Exercise 7 Activity 3 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex7/act3/ 4/6 Post-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. The addition of surfactant to the lung interior You correctly answered: increased airﬂow. 1

10/16/23, 11:26 AM PhysioEx Exercise 7 Activity 3 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex7/act3/ 5/6 Review Sheet Results 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: air ﬂow will increase due to resistance being decreased, my prediction was correct. 1 Why does surfactant affect airﬂow in this manner? Your answer: when the tension is decreased in the alveoli the surface area of gas exchange increases. 2 What effect did opening the valve have on the left lung? Why does this happen? Your answer: the lung collapsed due to the intrapleural and atmospheric pressure being equalized. 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: my prediction was correct because closing the valve didn't reserve the collapsed lung or pressure. 4 What emergency medical condition does opening the left valve simulate? Your answer: atelectasis and a collapsed lung. 5

10/16/23, 11:26 AM PhysioEx Exercise 7 Activity 3 https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex7/act3/ 6/6 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: aspiration with a needle and chest and surgery. 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 lungs would collapse and wouldn't be able to breath. 7

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