What shape are proximal convoluted tubule cells generally described as?

Proximal convoluted tubule (PCT) cells are generally described as being rectangular or columnar in shape. This characteristic shape is due to the function and structure of these cells, which are designed to maximize their surface area for efficient reabsorption of substances such as glucose, amino acids, and electrolytes from the filtrate back into the blood. The columnar shape allows for extensive microvillous extensions on their apical surfaces, further increasing the surface area and enhancing their absorptive capabilities. This unique morphology is key to their role in the renal system, allowing for effective filtrate processing in the nephron.