How does the spiral valve in a shark differ from that of an extremely long intestine of the human?

The spiral valve in sharks is a corkscrew-shaped structure that increases the surface area for nutrient absorption within their relatively short intestines, allowing them to efficiently extract nutrients from their prey. In contrast, humans have a long intestine that relies on its extended length and a series of folds and villi to maximize nutrient absorption. While both adaptations serve the same purpose of enhancing digestion and absorption, the spiral valve is a more compact solution suited to the shark's predatory lifestyle, while the human intestine is elongated to accommodate a varied diet.