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Q1. Normal, quiet exhalation needs which of the following muscles to contract? a.scalenes b.diaphragm c.intercostals d.none...

Q1. Normal, quiet exhalation needs which of the following muscles to contract?

a.scalenes

b.diaphragm

c.intercostals

d.none of the above

Q2. Which of the following pressure differences will keep your lungs inflated at rest?

a. pleural cavity pressure < pressure inside lung

b.pleural cavity pressure > pressure inside lung

c.pleural cavity pressure < atmospheric pressure

d.pleural cavity pressure > atmospheric pressure

Science   Anatomy-And-Physiology   
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Homework Answers

Answer #1

1. None of the above is the answer.

During normal quiet exhalation initially the diaphragm relaxes and increase the lung pressure. The intercostals relax and support this process. The scalenes are the muscles of the neck. This too relax during exhalation.

2. Plural cavity pressure < pressure inside lungs.

The plurals cavity pressure I always greater than the pulmonary pressure. This keeps the lungs inflated at rest. The pleural cavity pressure has a negative value comparing the pulmonary pressure. This is the transpulmonary pressure.

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