Multiple Choice
Which of the following is true about the movement of ions across excitable living membranes?
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6. The Membrane
Biological Membranes
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Where are chloride protein channels primarily located in the human body?
A
Within the mitochondrial inner membrane
B
In the plasma membranes of epithelial cells, especially in the lungs and pancreas
C
On the surface of red blood cells only
D
Embedded in the nuclear envelope
Verified step by step guidance1
Understand the role of chloride protein channels: Chloride channels are specialized proteins that facilitate the movement of chloride ions (Cl⁻) across cell membranes, which is essential for maintaining ion balance and fluid transport in the body.
Identify the primary location of chloride protein channels: These channels are primarily found in the plasma membranes of epithelial cells, especially in organs like the lungs and pancreas, where they regulate processes such as mucus secretion and ion transport.
Eliminate incorrect options: Chloride protein channels are not exclusively located within the mitochondrial inner membrane, on the surface of red blood cells, or embedded in the nuclear envelope. These locations do not align with their primary function in epithelial cells.
Relate to physiological functions: In the lungs, chloride channels help maintain airway hydration and mucus clearance, while in the pancreas, they are involved in the secretion of digestive enzymes and bicarbonate.
Conclude the correct answer: Based on their function and location, chloride protein channels are primarily located in the plasma membranes of epithelial cells, especially in the lungs and pancreas.
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