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 C
Explanation
a. Outermost layer that lies underneath the pericardial sac: This describes the epicardium, not the endocardium.
b. Outer layer that produces serous fluid: This describes the pericardium, particularly the visceral layer.
c. Inner layer that is continuous with the blood vessels: The endocardium is the innermost layer of the heart, lining the heart chambers and continuous with the endothelium of blood vessels.
d. Central layer that contracts and relaxes: This describes the myocardium, the muscular middle layer of the heart
Correct Answer is C
Explanation
a. Pulls the edges of the wound together: Wound closure is a later stage of healing, not a primary function of inflammation.
b. Causes bleeding to clean out the wound: While some bleeding might occur initially, inflammation doesn't actively cause bleeding to clean the wound.
c. Cleans out debris and toxins from the wound: Inflammation is a natural response to injury or infection. It involves increased blood flow, redness, swelling, and heat. This process helps to deliver white blood cells and other immune factors to the area to fight infection and remove debris and damaged tissues, promoting healing.
d. Builds the scab to protect the wound: Scab formation is a result of dried blood and plasma, not a direct effect of inflammation.
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