SCIENCE
CELL BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Carbon dioxide exchanging between muscle cells and red blood cells
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Water moving out of the small intestine
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Oxygen exchanging between red blood cells and liver cells
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Sodium being reabsorbed in the kidney
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Detailed explanation-1: -This is another important route for reabsorption of small solutes such as sodium chloride, and of water. Sodium continues to be reabsorbed in this part of the tubule via sodium/proton exchangers and actively transported through the tubule wall to the bloodstream by the sodium/potassium ATPase.
Detailed explanation-2: -Active transport An example of this type of transport is seen with the Na+/K+ ATPase pump on the basolateral cell membranes of the tubules. Sodium ( low intracellular concentration, high extracellular concentration)is pumped out of the cell into the interstitium.
Detailed explanation-3: -Most of the reabsorption of solutes necessary for normal body function such as amino acids, glucose, and salts takes place in the proximal part of the tubule. This reabsorption may be active, as in the case of glucose, amino acids, and peptides, whereas water, chloride, and other ions are passively reabsorbed.
Detailed explanation-4: -Sodium is absorbed (in exchange for potassium) passively through open channels in principal cells. These open channels are increased in response to aldosterone.