The route by which substances are reabsorbed by crossing through the cells of the renal tubule and collecting system is known as the:
a. paracellular route. b. transcellular route. c. primary active transport route. d. facultative route.
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1
Identify the key terms in the question: 'reabsorbed', 'crossing through the cells', 'renal tubule', and 'collecting system'.
Understand that reabsorption in the kidneys involves moving substances from the filtrate back into the blood.
Recognize that the 'paracellular route' involves substances moving between cells, not through them.
Note that the 'transcellular route' involves substances moving through the cells, which matches the description in the question.
Consider the other options: 'primary active transport' is a mechanism, not a route, and 'facultative route' is not a standard term in renal physiology.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Renal Tubule Function
The renal tubule is a critical component of the nephron in the kidney, responsible for the reabsorption of water, ions, and nutrients from the filtrate back into the bloodstream. Understanding its structure and function is essential for grasping how substances are processed in the kidney.
Transcellular transport involves substances moving through the cells of the renal tubule, while paracellular transport occurs between the cells. This distinction is crucial for understanding the mechanisms of reabsorption and the pathways substances take to enter the bloodstream.
Active transport refers to the movement of substances against their concentration gradient, requiring energy, typically in the form of ATP. This process is vital for reabsorbing essential ions and molecules in the kidneys, influencing overall fluid and electrolyte balance.