Week 5 homework Flashcards
Which of the following statements describing the mechanics of breathing is false?
Ventilation relies exclusively on contracting skeletal muscles.
The contraction of which of the following muscles will increase the thoracic cavity volume during inspiration?
The external intercostals
At the beginning of inspiration, the
thoracic cavity volume increases.
At the beginning of expiration, the
pressure in the thoracic cavity increases.
Tidal volume refers to the
amount of air inspired and then expired with each breath under resting conditions
Which muscles contract during quiet expiration
None of these muscles contract during quiet expiration
Measuring a persons FVC means that you are measuring
the amount of air that can be expelled when the subject takes the deepest possible inspiration and then forcefully expires as completely and rapidly as possible
Measuring a person’s FEV1 means that you are measuring
the amount of the VC that is expired during the first second of the FVC test
For a person suffering an asthma attack, inhaler medications are expected to
reduce airway resistance
Which of the following values does not include the ERV?
TV
A normal resting tidal volume is expected to be around
500 ml
Which respiratory process is impaired the most by emphysema?
Expiration
During an asthma attack
Inspiration and expiration is impaired
During moderate aerobic exercise, which respiratory variable increases the most?
Tidal volume
Inhaler medications
dilate the patient’s bronchioles
When obstructive lung disease develops, what happens to FEV1?
It decreases
Which of the following respiratory values represents a decreased flow rate during the obstructive lung disease?
FEV1
Which of the following statements about surface tension is false?
Surface tension acts to increase the size of the alveoli within the lungs.
Which of the following statements about surfactant is false?
Surfactant works by increasing the attraction of water molecules to each other.
Just before an inspiration begins, the pressure within the intrapleural cavity
is less than the pressure within the alveoli.
The respiratory condition of pneumothorax refers to
any opening that equalizes the intrapleural pressure with the atmospheric pressure.
A pneumothorax can lead to
atelectasis
