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Author Question: Which type of pressure is necessary within the thorax to maintain normal inhalation and expiration? ... (Read 121 times)

khang

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on: Jul 18, 2018
Which type of pressure is necessary within the thorax to maintain normal inhalation and expiration?
 
  a. Negative
  b. Positive
  c. Internal
  d. Blunt

Question 2

Which ribs have no fixation anteriorly?
 
  a. 5th, 6th, and 7th ribs
  b. 7th and 8th ribs
  c. 8th, 9th, and 10th ribs
  d. 11th and 12th ribs


kswal303

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Reply #1 on: Jul 18, 2018
Answer to Question 1

ANS: A
Negative, or subatmospheric, pressure is needed to avoid pressure changes that can be caused by openings in the thoracic wall. An uncontrolled opening in the thoracic wall can cause pressure change and be fatal.

Answer to Question 2

ANS: D
Although ribs 3 through 7 articulate with the main sternal body, and the 8th through 10th ribs join anteriorly to the above ribs' cartilage, the 11th and 12th ribs have no anterior fixation.


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