Which of the following is a feature of pleural membranes?
Secretes fluid to reduce friction between layers
Secretes a substance that reduces surface tension of alveoli
Secretes a substance to keep epithelial cells wet
Secretes fluid involved in protection from infections
The Correct Answer is A
a. Secretes fluid to reduce friction between layers: This is correct. The pleural membranes secrete pleural fluid, which reduces friction between the visceral and parietal layers during breathing.
b. Secretes a substance that reduces surface tension of alveoli: This describes the function of surfactant, which is secreted by alveolar cells, not pleural membranes.
c. Secretes a substance to keep epithelial cells wet: This is a general description that doesn't specifically apply to pleural membranes.
d. Secretes fluid involved in protection from infections: While pleural fluid may have some protective roles, its primary function is to reduce friction, not directly to protect from infections.
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Related Questions
Correct Answer is D
Explanation
a. Ureters are connected inside the urinary bladder by a two-way valve: The ureters connect to the urinary bladder through openings that act as one-way valves to prevent urine from flowing back into the ureters.
b. Ureters are fibrotic tubes connecting the kidneys to the urinary bladder: Ureters are not fibrotic; they are muscular tubes lined with a mucous membrane that propels urine from the kidneys to the bladder.
c. Ureters are covered by an outer layer of epithelial tissue: The outermost layer of the ureters is actually composed of connective tissue (adventitia), not epithelial tissue.
d. Ureters are extraperitoneal tubular structures: This is correct. Ureters are located outside the peritoneal cavity.
Correct Answer is A
Explanation
a. Exchanging of gas: Alveoli are the primary sites for gas exchange in the lungs, where oxygen is absorbed into the blood and carbon dioxide is expelled.
b. Removing pathogens that are breathed in: This is a function of the respiratory tract's immune components, like macrophages in the alveoli, but not the primary function.
c. Containing mucus-producing goblet cells: Goblet cells are found in the respiratory tract but not in the alveoli.
d. Secreting surfactant to reduce surface tension: Alveolar cells do secrete surfactant, which is crucial for reducing surface tension and preventing alveolar collapse, but the primary function is gas exchange.
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