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 B
Explanation
a: Decreased osmotic pressure - Decreased osmotic pressure would lead to fluid retention within the capillaries, not lymph production.
b. Increased hydrostatic pressure: Lymph is produced when there is an increase in hydrostatic pressure within the capillaries, which forces fluid and solutes out into the interstitial space, forming lymph.
c: Decreased hydrostatic pressure - Decreased hydrostatic pressure would result in decreased filtration of fluid from the capillaries, hindering lymph production.
d: Increased osmotic pressure - Increased osmotic pressure would draw fluid back into the capillaries, opposing lymph formation.
Correct Answer is C
Explanation
a. Kidneys: Kidney dysfunction can affect waste elimination and fluid balance but does not typically cause yellow sclera.
b. Appendix: The appendix is involved in the immune response and gut flora regulation but not in causing yellow sclera.
c. Liver: Liver dysfunction can lead to jaundice, where bilirubin accumulates in the blood and tissues, causing yellowing of the skin and sclera.
d. Spleen: The spleen is involved in blood filtration and immune response but does not directly cause yellow sclera
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