If there is more surface area available to absorb a nutrient, that means that more nutrient can be absorbed at one time, thus making it go faster.
For example. Let's say that your nutrient, for whatever reason, is a block (like those old kid's toys). You and your friend have to race to see who can push 100 blocks through faster. You are given a board that is large enough to hold four block openings (its surface area is large enough to absorb four at one time) and your friend's is only big enough for two at a time. You will win, because you have more surface area.
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Fungi make their food via absorption, and a large surface area makes nutrient absorption extremely efficient.
The jejunum is the middle section of the small intestine, situated between the duodenum and the ileum. Its primary function is the absorption of nutrients, including carbohydrates, proteins, and fats, as well as vitamins and minerals, into the bloodstream. The jejunum has a highly folded inner surface, which increases its surface area for efficient nutrient absorption. Additionally, it plays a role in the digestion of food through the action of digestive enzymes.
To nutrient-poor environments..
For example, the amount of nutrients a cell can absorb are proportional to its surface area.
All chemical reactions take place on surfaces = so very important