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AACN Critical Care Nursing Questions and answers
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AACN Critical Care Nursing Questions and answers
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Solution 2024/2025Pepper
AACN Critical Care Nursing
Cellular respiration cannot be directly measured but is estimated by the amount of
CO2 produced (V̇CO2)
and the amount of O2 consumed (V̇O2).
V̇CO2
CO2 produced in celluar respiration
V̇O2
and the amount of O2 consumed in cellular respiration
external respiration
The Exchange of O2 and CO2 at the alveolar-capillary level.
It is the ratio of the CO2 produced to the O2 taken up per minute.
V̇CO2/min : V̇O2/min
Proper functioning of the respiratory circuit requires efficient interaction of the
1. respiratory
2. circulatory
3. neuromuscular systems.
, Solution 2024/2025
Pepper
In addition to its primary function of O2 and CO2 exchange, the lung also carries out metabolic and endocrine
functions as a source of hormones and a site of hormone metabolism.
In addition, the lung is a target of hormonal actions by other endocrine organs
(e.g., surfactant production and potentially activation of bradykinin).
Anatomic divisions of Lungs:
Right lung:
Left Lung:
Right Lung: 3 lobes—upper, middle, lower
Left lung (two lobes—upper, lower).
Lobes are divided into bronchopulmonary segments
10 - RIGHT
9 - LEFT
Bronchopulmonary segments are subdivided into
secondary lobules
Secondary Lobules
Independent respiratory units of lung
each bronchopulmonary segment is supplied independently by:
a (tertiary) segmental bronchus
a tertiary branch of pulmonary artery - carry low oxygen ("venous") blood to lungs for
oxygenation
a branch of bronchial artery
What does a a tertiary branch of pulmonary artery do for secondary lobules?
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