WGU D115 PATHO, UNIT 4-
PULMONARY SYSTEM WITH
100% CORRECT ANSWERS
GRADED A+ LATEST UPDATE
2026
Alveoli - answer-tiny sacs of lung tissue specialized for the movement of gases between
air and blood
Functions of the pulmonary system - answer-ventilate alveoil, diffuse gases in and out
of blood, perfuse the lungs so that the organs and tissues of the body receive blood that
is rich in O2 and low in CO2. (Through ventilation, diffusion and perfusion)
Ventilation - answer-Mechanical movement of air in and out of the lungs, not the same
as respiration's
Respiration - answer-Exchange of O2 and CO2 during cellular metabolism
pulmonary function tests (PFTs) - answer-tests that measure the ventilation mechanics
of the lungs: airway function, lung volume, and the capacity of the lungs to exchange
oxygen and carbon dioxide efficiently
Types of pulmonary function tests - answer-Simple spirometry
Pulmonary diffusing capacity
Residual volume
Oximetry
Capnography
Functional reserve capacity (FRC)
Total lung capacity
, Arterial blood gas analysis
Thoracic imaging
hypercapnia - answer-excessive carbon dioxide in arterial blood
hypoxemia - answer-deficient amount of oxygen of arterial blood, alveoli may be
ventilated but not perfused
Kussmaul respirations - answer-Deep, rapid breathing; usually the result of an
accumulation of certain acids when insulin is not available in the body.
Cheyne-Stokes respiration - answer-pattern of breathing characterized by a gradual
increase of depth and sometimes rate to a maximum level, followed by a decrease,
resulting in apnea
spirometry - answer-Measures volume and flow of air inhaled and exhaled, plotted
against time during difficult breathing maneuvers, normal is 80% in 1 second
Aging and the Pulmonary System - answer-Loss of elastic recoil
Stiffening of the chest wall
Alterations in gas exchange
Increases in flow resistance
Decreased exercise tolerance
Alveoli lose wall tissue and capillaries
Decrease PaO2 and ventilators reserve
pulmonary circulation - answer-flow of blood from the heart to the lungs and back to the
heart
PULMONARY SYSTEM WITH
100% CORRECT ANSWERS
GRADED A+ LATEST UPDATE
2026
Alveoli - answer-tiny sacs of lung tissue specialized for the movement of gases between
air and blood
Functions of the pulmonary system - answer-ventilate alveoil, diffuse gases in and out
of blood, perfuse the lungs so that the organs and tissues of the body receive blood that
is rich in O2 and low in CO2. (Through ventilation, diffusion and perfusion)
Ventilation - answer-Mechanical movement of air in and out of the lungs, not the same
as respiration's
Respiration - answer-Exchange of O2 and CO2 during cellular metabolism
pulmonary function tests (PFTs) - answer-tests that measure the ventilation mechanics
of the lungs: airway function, lung volume, and the capacity of the lungs to exchange
oxygen and carbon dioxide efficiently
Types of pulmonary function tests - answer-Simple spirometry
Pulmonary diffusing capacity
Residual volume
Oximetry
Capnography
Functional reserve capacity (FRC)
Total lung capacity
, Arterial blood gas analysis
Thoracic imaging
hypercapnia - answer-excessive carbon dioxide in arterial blood
hypoxemia - answer-deficient amount of oxygen of arterial blood, alveoli may be
ventilated but not perfused
Kussmaul respirations - answer-Deep, rapid breathing; usually the result of an
accumulation of certain acids when insulin is not available in the body.
Cheyne-Stokes respiration - answer-pattern of breathing characterized by a gradual
increase of depth and sometimes rate to a maximum level, followed by a decrease,
resulting in apnea
spirometry - answer-Measures volume and flow of air inhaled and exhaled, plotted
against time during difficult breathing maneuvers, normal is 80% in 1 second
Aging and the Pulmonary System - answer-Loss of elastic recoil
Stiffening of the chest wall
Alterations in gas exchange
Increases in flow resistance
Decreased exercise tolerance
Alveoli lose wall tissue and capillaries
Decrease PaO2 and ventilators reserve
pulmonary circulation - answer-flow of blood from the heart to the lungs and back to the
heart
