MASTERING PROXIMAL CONVOLUTED TUBULE REABSORPTION AND SECRETION

In this renal physiology lecture, Tumnad takes you on a detailed concept of the Proximal Convoluted Tubule (PCT)—the first major segment of the nephron responsible for the bulk of solute and water reabsorption. This lecture builds on your understanding of glomerular filtration and lays the groundwork for mastering how the kidney fine-tunes the composition of filtrate in early tubular processing. The lecture continues to dives deep into the key transport mechanisms: Na⁺/K⁺ ATPase, sodium-glucose cotransporters (SGLT2), bicarbonate reabsorption via carbonic anhydrase, and organic acid/base secretion, including the handling of drugs and toxins. We also discuss the concept of obligatory water reabsorption, the concept that water follows solutes to maintain osmotic balance in this segment. #renal #proximalconvolutedtubule #physiology