Respiratory System Flashcards
Which cartilage belonging to the larynx anchors the vocal cords? epiglottis thyroid cartilage cricoid cartilage arytenoid cartilages
arytenoid cartilages
The main site of gas exchange is the ________.
alveoli respiratory bronchiole alveolar sacs alveolar duct
alveoli
Which of the following maintains the patency (openness) of the trachea?
surfactant production pseudostratified ciliated epithelium surface tension of water C-shaped cartilage rings
C-shaped cartilage rings
Most inspired particles such as dust fail to reach the lungs because of the ________.
ciliated mucous lining in the nose porous structure of turbinate bones action of the epiglottis abundant blood supply to nasal mucosa
ciliated mucous lining in the nose
The olfactory mucosal lining of the nasal cavity contains the receptors for the sense of smell.
True False
True
The paired lungs occupy all of the thoracic cavity.
True False
False
The parietal pleura lines the thoracic wall.
True False
True
Nasal conchae mainly work on inhalation to warm and moisten air. They serve minor functions for exhalation.
True False
False
Which of the following pressures rises and falls with the phases of breathing, but eventually equalizes with the atmospheric pressure? transpulmonary pressure atmospheric pressure intrapulmonary pressure intrapleural pressure
intrapulmonary pressure
Which of the following pressures must remain negative to prevent lung collapse? transpulmonary pressure atmospheric pressure intrapleural pressure intrapulmonary pressure
intrapleural pressure
Calculate the transpulmonary pressure if atmospheric pressure is 755 mm Hg.
4 mm Hg -1 mm Hg -4 mm Hg 9 mm Hg
4 mmHg
Which of the following gives the relationship between the pressure and volume of a gas? Boyle's law Dalton's law of partial pressures Haldane effect Henry's law
Boyle’s law
Which of the following pressure relationships best illustrates when inspiration will occur?
Ppul = Patm
Ppul Patm
Ppul
Ppul
Which volumes are combined to provide the inspiratory capacity?
tidal volume (TV) + inspiratory reserve volume (IRV) + expiratory reserve volume (ERV) + residual volume (RV)
tidal volume (TV) + inspiratory reserve volume (IRV) + expiratory reserve volume (ERV)
expiratory reserve volume (ERV) + residual volume (RV)
tidal volume (TV) + inspiratory reserve volume (IRV)
tidal volume (TV) + inspiratory reserve volume (IRV)
What is the volume of the total amount of exchangeable air for a healthy, young adult male? 2400 ml 4800 ml 6000 ml 3600 ml
4800 ml
Which form of CO2 transport accounts for the least amount of CO2 transported in blood?
as carbon monoxide in plasma dissolved in plasma chemically bound to hemoglobin as bicarbonate ion in plasma
dissolved in plasma
In pneumothorax, the lung collapses because ______.
intrapleural pressure is lower than transpulmonary pressure intrapleural pressure is higher than intrapulmonary pressure intrapulmonary pressure is lower than transpulmonary pressure intrapulmonary pressure is higher than atmospheric pressure
intrapleural pressure is higher than intrapulmonary pressure
Surfactant helps to prevent the alveoli from collapsing by ________.
humidifying the air before it enters protecting the surface of alveoli from dehydration and other environmental variations warming the air before it enters interfering with the cohesiveness of water molecules, thereby reducing the surface tension of alveolar fluid
interfering with the cohesiveness of water molecules, thereby reducing the surface tension of alveolar fluid
Which of these is not a characteristic of emphysema? A) bronchial edema B) destruction of alveolar walls C) loss of lung elasticity D) air trapping
A) bronchiole edema
Select the correct statement about oxygen transport in blood ________.
A) During normal activity, a molecule of hemoglobin returning to the lungs contains one molecule of O2
B) During conditions of acidosis, hemoglobin is able to carry oxygen more efficiently
C) Increased BPG levels in the red blood cells enhance oxygen-carrying capacity
D) A 50% oxygen saturation level of blood returning to the lungs might indicate an activity level higher
than normal
D) A 50% oxygen saturation level of blood returning to the lungs might indicate an activity level higher
Select the correct statement about the physical factors influencing pulmonary ventilation.
A) A decrease in compliance causes an increase in ventilation.
B) A lung that is less elastic will require less muscle action to perform adequate ventilation.
C) As alveolar surface tension increases, additional muscle action will be required.
D) Surfactant helps increase alveolar surface tension.
C) As alveolar surface tension increases, additional muscle action will be required.
Which of the following is not possible?
A) Gas flow equals pressure gradient over resistance.
B) Pressure gradient equals gas flow over resistance.
C) Resistance equals pressure gradient over gas flow.
D) The amount of gas flowing in and out of the alveoli is directly proportional to the difference in pressure or pressure gradient between the external atmosphere and the alveoli.
B) Pressure gradient equals gas flow over resistance.
The erythrocyte count increases after a while when an individual goes from a low to a high altitude because ________.
A) the temperature is lower at higher altitudes
B) the basal metabolic rate is higher at high altitudes
C) the concentration of oxygen and/or total atmospheric pressure is higher at higher altitudes
D) the concentration of oxygen and/or total atmospheric pressure is lower at high altitudes
D) the concentration of oxygen and/or total atmospheric pressure is lower at high altitudes
The factors responsible for holding the lungs to the thorax wall are ________.
A) the smooth muscles of the lung
B) the diaphragm and the intercostal muscles alone
C) the visceral pleurae and the changing volume of the lungs
D) surface tension from pleural fluid, negative pressure, and atmospheric pressure on the thorax
D) surface tension from pleural fluid, negative pressure, and atmospheric pressure on the thorax