Here are the essential concepts you must grasp in order to answer the question correctly.
Kidney Structure and Function
The kidneys contain a complex network of blood vessels, including glomeruli and capillary beds, which play crucial roles in filtration and reabsorption. The first capillary bed in the kidneys is the glomerulus, where blood filtration occurs, rather than the peritubular capillaries.
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Afferent and Efferent Arterioles
Afferent arterioles supply blood to the glomeruli, while efferent arterioles drain blood from them. This arrangement is essential for maintaining glomerular filtration pressure and regulating blood flow within the nephron.
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Arteriolar Diameter and GFR
Peritubular Capillaries
Peritubular capillaries surround the nephron tubules and are involved in the reabsorption of water, ions, and nutrients from the filtrate back into the bloodstream. They receive blood from the efferent arterioles of the glomeruli, not directly from the afferent arterioles.
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Introduction to Capillaries