Select all of the following that are correct regarding the time constant of the

Question

Select all of the following that are correct regarding the time constant of the lung.

the time constant is directly proportional to compliance

the time constant is directly proportional to resistance

an expiratory time equal to 5 time constants is required to empty the lung

increasing elastance will shorten the time constant

correct

incorrect

      -       A.       B.   

the time constant is directly proportional to compliance

      -       A.       B.   

the time constant is directly proportional to resistance

      -       A.       B.   

an expiratory time equal to 5 time constants is required to empty the lung

      -       A.       B.   

increasing elastance will shorten the time constant

A.

correct

B.

incorrect

Explanation / Answer

time constant is product of compliance and resistance.

lower the compliance, shorter the time constant

higher the resistance, longer the tiime constant.

3 time constants fill the lung to 95%

increase in elastance would decrease time to fill the lungs.

3rd statement is incorrect. 1st, 2nd and 4th are correct

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