Which of the following best describes the visceral and parietal pleura?
They are surfactant secreting membranes
They line the inner wall of the trachea, bronchi, and bronchioles
They are serous membranes
They line the mediastinum
The Correct Answer is C
A. They are surfactant secreting membranes: Surfactant is secreted by alveolar cells, not pleural membranes.
B. They line the inner wall of the trachea, bronchi, and bronchioles: These are lined by mucosa, not pleura.
C. They are serous membranes: The visceral pleura covers the lungs; the parietal pleura lines the thoracic cavity.
D. They line the mediastinum: The pleura surround the lungs, not the mediastinum specifically.
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Related Questions
Correct Answer is D
Explanation
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.
Correct Answer is A
Explanation
A. Cyanosis: Cyanosis is a common sign of hypoxia caused by low oxygen levels in the blood.
B. Bradycardia: Hypoxia typically causes tachycardia, not bradycardia.
C. Pallor: Pallor may indicate anemia or poor circulation, not specifically hypoxia.
D. Bradypnea: Hypoxia usually triggers an increased respiratory rate (tachypnea), not bradypnea.
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