During the gas exchanges occurring in the lungs:
Carbon dioxide diffuses into the blood and oxygen diffuses into the alveoli
Oxygen diffuse into the blood and carbon dioxide diffuses into the alveoli
Both oxygen and carbon dioxide diffuse from the alveoli into the blood
Both oxygen and carbon dioxide diffuse from the blood into the alveoli
The Correct Answer is B
A. Carbon dioxide does diffuse into the blood from the alveoli, but oxygen diffuses into the blood from the alveoli, not into the alveoli.
B. Oxygen diffuses from the alveoli into the blood where it binds to hemoglobin in red blood cells, while carbon dioxide diffuses from the blood into the alveoli to be exhaled.
C. Both oxygen and carbon dioxide do not diffuse from the alveoli into the blood at the same time. Only oxygen moves into the blood, and carbon dioxide moves in the opposite direction, from the blood to the alveoli.
D. While carbon dioxide moves from the blood into the alveoli, oxygen moves in the opposite direction, from the alveoli into the blood, so this answer is incorrect.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. A pneumothorax occurs when there is a collapse of the lung due to air entering the pleural cavity, but this is not directly related to the lungs dropping below atmospheric pressure.
B. Air flows out of the lungs when the pressure inside the lungs is higher than atmospheric pressure (e.g., during exhalation).
C. When the pressure in the lungs drops below atmospheric pressure, it creates a vacuum effect, causing air to flow into the lungs during inhalation. This is how normal breathing works.
D. Bronchiolar constriction can cause respiratory distress, but it is not directly linked to a drop in lung pressure. Instead, constriction happens due to factors like asthma or allergies, not pressure changes.
Correct Answer is B
Explanation
A. Active transport requires energy and is used to move substances against their concentration gradient. Oxygen moves along its concentration gradient, so active transport is not involved.
B. Diffusion is the correct mechanism. Oxygen moves from an area of higher concentration in the alveoli to a lower concentration in the pulmonary capillaries through the alveolar-capillary membrane. This passive process does not require energy.
C. Endocytosis is a process cells use to engulf large particles or substances, not how gases like oxygen are transported.
D. Pinocytosis is a form of endocytosis specifically for fluid uptake and is not involved in the respiratory gas exchange process
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