This topic contains a solution. Click here to go to the answer

Author Question: Which of the following are effects of surface tension forces in the air-filled lung? 1. It ... (Read 73 times)

2125004343

  • Hero Member
  • *****
  • Posts: 566
Which of the following are effects of surface tension forces in the air-filled lung?
 
  1. It increases the elastic recoil of the lung (promoting collapse).
  2. It makes the lung harder to inflate than if it were filled with fluid.
  3. It decreases the lung's elasticity as volume increases.
  a. 1 and 2 only
  b. 2 and 3 only
  c. 1 and 3 only
  d. 1, 2, and 3

Question 2

During normal tidal ventilation, the transpulmonary pressure gradient (Palv  Ppl) reaches its maximum value at what point in the cycle?
 
  a. Midinspiration
  b. End-expiration
  c. End-inspiration
  d. Mid-expiration



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

cuttiesgirl16

  • Sr. Member
  • ****
  • Posts: 345
Answer to Question 1

ANS: A
Less pressure is needed to inflate a fluid-filled lung to a given volume. This phenomenon indi-cates that a gas-fluid interface in the air-filled lung changes its inflation-deflation characteristics. The recoil of the lung is therefore a combination of tissue elasticity and these surface tension forces in the alveoli. During inflation, additional pressure is needed to overcome surface tension forces.

Answer to Question 2

ANS: C
At this point, called end-inspiration, alveolar pressure has returned to 0 and the transpulmonary pressure gradient reaches its maximal value (for a normal breath) of approximately 10 cm H2O.




2125004343

  • Member
  • Posts: 566
Reply 2 on: Jul 16, 2018
Wow, this really help


tanna.moeller

  • Member
  • Posts: 328
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

 

Did you know?

The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.

Did you know?

There are actually 60 minerals, 16 vitamins, 12 essential amino acids, and three essential fatty acids that your body needs every day.

Did you know?

More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

Did you know?

Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

Did you know?

The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.

For a complete list of videos, visit our video library