PhysioEx Exercise 7

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The minute ventilation is _______.

calculated by multiplying the rate of respiration times TV

Under normal conditions, the forced expiratory volume is normally _______.

75 – 85% of the vital capacity

When the radius of the airway was decreased, _______.

expiratory reserve volume decreased

During forced exhalation, _______.

the internal intercostals contract

When the diaphragm contracts, _______.

it flattens out

Which of the following is a passive process?


What is the driving force for the movement of air into the lungs?

the pressure gradient

Which of the following describes the volume of air exhaled during passive breathing?

tidal volume

What is the difference between TLC and VC?

TLC includes RV.

Which of the following is(are) obstructive conditions?

emphysema and an acute asthma attack

Which of the following resulted in an increase in tidal volume above the normal value?

moderate exercise

A normal FEV1% was seen with _______.

acute asthma attack plus inhaler

With an acute asthma attack, ________________ increased when compared to normal values.


Why is normal exhalation passive?

Respiratory muscles are relaxing and elastic tissue in the lungs recoils.

With emphysema, the muscles that contract with normal exhalation include which of the following?

internal intercostals and abdominal muscles

During an acute asthma attack, the obstruction is caused by _______.

bronchiole smooth muscle spasms

Which of the following would increase with exercise?

tidal volume, frequency of breathing and minute volume

Which amount of surfactant resulted in the greatest amount of airflow?


How did the pressure in the left intrapleural cavity change when the valve was opened?

It went from a negative number to zero and the pressure in the intrapleural cavity equalized with the atmospheric pressure

How did the total air flow in this trial differ from that in the previous trial in which the pleural cavities were intact?

It was cut in half.

Without surfactant, _______.

the surface tension of the liquid in the alveoli would be greater and the alveoli would collapse

The pressure in the pleural cavity is called the _______.

intrapleural pressure

The pressure in the pleural cavity is _______.

less than the pressure in the alveoli and less than atmospheric pressure

In this activity, the pressure in the pleural cavity would be located _______.

between the bell jar and the outer wall of the lung

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