Stimulating the phrenic nerve:
is responsible for the pumping of 02 from the alveoli into the pulmonary capillaries
Is responsible for exhalation
Decreases thoracic volume
Causes the diaphragm to contract
The Correct Answer is D
A. is responsible for the pumping of O2 from the alveoli into the pulmonary capillaries: gas exchange occurs by diffusion, not nerve stimulation.
B. Is responsible for exhalation: exhalation is a passive process; phrenic nerve controls diaphragm contraction for inhalation.
C. Decreases thoracic volume: diaphragm contraction increases thoracic volume.
D. Causes the diaphragm to contract: the phrenic nerve innervates the diaphragm and stimulates its contraction for inhalation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Grapelike sacs located very close to pulmonary capillaries: This correctly describes the structure of alveoli.
B. Located within the lungs: Alveoli are indeed located in the lungs.
C. Primarily concerned with gas exchange: Alveoli are the main site of gas exchange in the lungs.
D. Contain smooth muscle: Alveoli do not contain smooth muscle; this is a feature of bronchi and bronchioles.
Correct Answer is A
Explanation
A. Refer to breathing rates: Bradypnea = slow breathing; tachypnea = rapid breathing. Both describe respiratory rates.
B. Are respiratory changes caused by exercise: Tachypnea may occur with exercise, but bradypnea does not.
C. Are upper respiratory infections: These are breathing patterns, not infections.
D. Are relieved by sitting upright: This describes orthopnea, not bradypnea/tachypnea.
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