BME 235 Physiology -
Respiratory System
questions with 100% correct
answers(100% accuracy)
Functions of the respiratory system - answer gas exchange,
communication, olfaction, acid-base balance, blood pressure regulation
upper respiratory tract - answer nose, pharynx, larynx
lower respiratory tract - answer larynx, trachea, bronchi, lungs
visceral pleura - answer serous membrane that covers lungs
parietal pleura - answer adheres to inner surface of rib cage and superior
surface of diaphragm
# of lobes in each lung - answer left = 2, right = 3
largest air tubes in the bronchial tree - answer main bronchi
smallest air tubes in the bronchial tree - answer bronchioles
order of the bronchial tree - answer main bronchi > Secondary bronchi >
tertiary bronchi > bronchioles > terminal bronchioles > respiratory
bronchioles, alveoli
structure of respiratory bronchioles - answer contain alveoli
, alveoli - answer microscopic air sacs in the lungs that exchange gases with
the bloodstream
type I alveolar cells - answer (squamous) thin, broad cells that allow rapid
gas diffusion between alveolus and bloodstream
Type II alveolar cells - answer (great) round cells that secrete pulmonary
surfactant that prevents lungs from collapsing during exhalation
unconscious breathing - answer controlled by 3 respiratory centers in the
brainstem
location of three respiratory centers in the brainstem - answer medulla
oblongata - ventral respiratory group (VRG), dorsal respiratory group
(DRG). Pons - pontine respiratory group (PRG)
conscious breathing - answer controlled by motor cortex of frontal lobe of
cerebrum. bypasses brainstem
central chemoreceptors - answer located in medulla, controls unconscious
breathing by responding to changes in pH of cerebrospinal fluid. (pH of
fluid reflects CO2 of blood)
peripheral chemoreceptors - answer located in carotid and aortic bodies of
the large arteries above the heart. control unconscious breathing by
responding to the O2 and CO2 content and the pH of blood
if lung volume increases, what happens to pressure inside the lungs? -
answer lung pressure decreases. once air in thoracic cavity drops below
atm. pressure, air flows into lungs
what causes lung volume to increase? - answer muscular contraction of
diaphragm and other respiratory muscles
Respiratory System
questions with 100% correct
answers(100% accuracy)
Functions of the respiratory system - answer gas exchange,
communication, olfaction, acid-base balance, blood pressure regulation
upper respiratory tract - answer nose, pharynx, larynx
lower respiratory tract - answer larynx, trachea, bronchi, lungs
visceral pleura - answer serous membrane that covers lungs
parietal pleura - answer adheres to inner surface of rib cage and superior
surface of diaphragm
# of lobes in each lung - answer left = 2, right = 3
largest air tubes in the bronchial tree - answer main bronchi
smallest air tubes in the bronchial tree - answer bronchioles
order of the bronchial tree - answer main bronchi > Secondary bronchi >
tertiary bronchi > bronchioles > terminal bronchioles > respiratory
bronchioles, alveoli
structure of respiratory bronchioles - answer contain alveoli
, alveoli - answer microscopic air sacs in the lungs that exchange gases with
the bloodstream
type I alveolar cells - answer (squamous) thin, broad cells that allow rapid
gas diffusion between alveolus and bloodstream
Type II alveolar cells - answer (great) round cells that secrete pulmonary
surfactant that prevents lungs from collapsing during exhalation
unconscious breathing - answer controlled by 3 respiratory centers in the
brainstem
location of three respiratory centers in the brainstem - answer medulla
oblongata - ventral respiratory group (VRG), dorsal respiratory group
(DRG). Pons - pontine respiratory group (PRG)
conscious breathing - answer controlled by motor cortex of frontal lobe of
cerebrum. bypasses brainstem
central chemoreceptors - answer located in medulla, controls unconscious
breathing by responding to changes in pH of cerebrospinal fluid. (pH of
fluid reflects CO2 of blood)
peripheral chemoreceptors - answer located in carotid and aortic bodies of
the large arteries above the heart. control unconscious breathing by
responding to the O2 and CO2 content and the pH of blood
if lung volume increases, what happens to pressure inside the lungs? -
answer lung pressure decreases. once air in thoracic cavity drops below
atm. pressure, air flows into lungs
what causes lung volume to increase? - answer muscular contraction of
diaphragm and other respiratory muscles
