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Multiple Choice
Which of the following statements about glomerular filtration in the kidneys is correct?
A
Glomerular filtration requires the direct use of oxygen by podocytes.
B
Glomerular filtration occurs in the collecting duct of the nephron.
C
Glomerular filtration is an ATP-driven active transport process.
D
Glomerular filtration is a passive process driven by blood pressure, not ATP.
Verified step by step guidance
1
Understand the concept of glomerular filtration: Glomerular filtration is the process by which the kidneys filter blood to form urine. It occurs in the glomerulus, a network of capillaries located in the nephron, and is driven by blood pressure rather than active transport mechanisms.
Clarify the role of podocytes: Podocytes are specialized cells in the glomerulus that form part of the filtration barrier. They do not directly use oxygen or energy to facilitate filtration; instead, they provide structural support and regulate the filtration process passively.
Identify the location of glomerular filtration: Glomerular filtration occurs in the glomerulus, not in the collecting duct. The collecting duct is involved in the final concentration and reabsorption of water and solutes, not the initial filtration of blood.
Differentiate between passive and active processes: Glomerular filtration is a passive process driven by hydrostatic pressure (blood pressure) in the glomerular capillaries. It does not require ATP or active transport mechanisms.
Summarize the correct statement: The correct statement is that glomerular filtration is a passive process driven by blood pressure, not ATP. This highlights the importance of blood pressure in kidney function and filtration efficiency.