Q: From where does tubular reabsorption occur in the nephron tubules?  

Answer: B

Tubular reabsorption is the process of reabsorbing useful substances such as water, glucose, amino acids, and electrolytes from the nephron tubules into the peritubular capillaries. The peritubular capillaries are a network of small blood vessels that surround the nephron tubules. These capillaries have a high surface area and low blood pressure, allowing for the reabsorption of filtrate into the bloodstream. As the filtrate passes through the proximal and distal convoluted tubules, useful substances are reabsorbed from the filtrate and transported into the peritubular capillaries. The peritubular capillaries then carry these substances to the renal vein, which returns them to the general circulation.

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