Week 3 - Respiratory Practice Quiz Flashcards
Which of the choices below is not a functional process performed by the respiratory system?
A) pulmonary respiration
B) transport of respiratory gases
C) pulmonary ventilation
D) external respiration
B) transport of respiratory gases
The loudness of a person’s voice depends on the ______
A) force with which air rushes across the vocal folds
B) thickness of vestibular folds
C) length of the vocal folds
D) strength of the intrinsic laryngeal muscles
A) force with which air rushes across the vocal folds
The walls of the alveoli are composed of two types of cells, type I and type II. The function of type II is to ______
A) protect the lungs from bacterial invasion
B) replace mucus in the alveoli
C) trap dust and other debris
D) secrete surfactant
D) secrete surfactant
Complete the following statement using the choices below. Air moves out of the lungs when the pressure inside the lungs is
A) less than the pressure in the atmosphere.
B) greater than the intra-alveolar pressure.
C) equal to the pressure in the atmosphere.
D) greater than the pressure in the atmosphere.
D) greater than the pressure in the atmosphere.
Unlike inspiration, expiration is a passive act because no muscular contractions are involved. Expiration, however, depends on two factors. Which of the choices below lists those two factors?
A) the expansion of respiratory muscles that were contracted during inspiration and the lack of
surface tension on the alveolar wall
B) the negative feedback of expansion fibers used during inspiration and the outward pull of
surface tension due to surfactant
C) the recoil of elastic fibers that were stretched during inspiration and the inward pull of
surface tension due to the film of alveolar fluid
D) combined amount of CO2 in the blood and air in the alveoli
C) the recoil of elastic fibers that were stretched during inspiration and the inward pull of
surface tension due to the film of alveolar fluid
Surfactant helps to prevent the alveoli from collapsing by _____.
A) warming the air before it enters
B) interfering with the cohesiveness of water molecules, thereby reducing the surface tension of
alveolar fluid
C) protecting the surface of alveoli from dehydration and other environmental variations
D) humidifying the air before it enters
B) interfering with the cohesiveness of water molecules, thereby reducing the surface tension of
alveolar fluid
For gas exchange to be efficient, the respiratory membrane must be _.
A) at least 3 micrometers thick
B) between 5 and 6 micrometers thick
C) 0.5 to I micrometer thick
D) The thickness of the respiratory membrane is not important in the efficiency of gas exchange.
C) 0.5 to I micrometer thick
The most powerful respiratory stimulus for breathing in a healthy person is _____
A. Loss of Oxygen
B. Increase of Carbon Dioxide
C. pH (alkalosis)
D. pH (acidosis)
B. Increase of Carbon Dioxide
Which of the choices below describes the forces that act to pull the lungs away from the thorax wall and thus collapse the lungs?
A) compliance and the surface tension of the alveolar fluid
B) compliance and transpulmonary pressures
C) the natural tendency for the lungs to recoil and transpulmonary pressures
D) the natural tendency for the lungs to recoil and the surface tension of the alveolar fluid
D) the natural tendency for the lungs to recoil and the surface tension of the alveolar fluid
Which of the following is not true of the respiratory tract from the medium bronchi to the alveoli?
A) Lining of the tubes changes from ciliated columnar to simple squamous epithelium in the
alveoli.
B) Proportionally, smooth muscle decreases uniformly.
C) Cartilage gradually decreases and disappears at the bronchioles.
D) Resistance to airflow increases due to the increase in cross-sectional diameter.
D) Resistance to airflow increases due to the increase in cross-sectional diameter.
Tidal volume is air _.
A) inhaled after normal inspiration
B) remaining in the lungs after forced expiration
C) forcibly expelled after normal expiration
D) exchanged during normal breathing
D) exchanged during normal breathing
Which of the choices below determines the direction of respiratory gas movement?
A) partial pressure gradient
B) the temperature
C) solubility in water
D) molecular weight and size of the gas molecule
A) partial pressure gradient
The lung volume that represents the total volume of exchangeable air is the ___.
A) tidal volume
B) expiratory reserve volume
C) inspiratory capacity
D) vital capacity
D) vital capacity
Because the lungs are filled with fluid during fetal life, which of the following statements is true regarding respiratory exchange?
A) Respiratory exchanges are not necessary.
B) Because the lungs develop later in gestation, fetuses do not need a mechanism for respiratory
exchange.
C) Respiratory exchanges are made through the ductus arteriosus.
D) Respiratory exchanges are made through the placenta.
D) Respiratory exchanges are made through the placenta.
Which of the following is not a stimulus for breathing?
A) arterial Po2 below 60 mm Hg
B) rising blood pressure
C) arterial pH resulting from CO2 retention
D) rising carbon dioxide levels
B) rising blood pressure
