Because it increases the surface area available for transfer of materials.
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The inner lining of the intestine has folds in it so as to increase the surface are. This greater aids in the absorption of nutrients from the gut. The larger the surface area, the greater the rate of absorption.
It increases the surface area of the cell membrane. By having more surface area, more matter can be moved in and out of the cell.
It gives a cell greater surface area, if they are folded, they are more compact, allowing the cell to do more. /\/\/\/\/\/\/\/\ _______________ Both drawings have 16 segments of the same length. The one above is folded and is able to hold the same in less space, or more in the same space. /\/\/\/\/\/\/\/\ = 16 __________ = 10 (same space, but more area)
the cell lining of the small intestine is called villi and are small, finger-like projections that are used to increase surface area.
Epithelial cells cover the surface of the intestine.
Villi are fingerlike projection from a surface and in the intestine they are one cell thick with blood vessels and lacteal. The funciton is to increase the surface area of the intestine and so increasing the ammount of absorption.
1. The small intestine is LONG- this ensures food remains in the small intestine long enough for the products of digestion to be fully absorbed into the bloodstrem. 2. The Small intestine is HIGHLY FOLDED into villi (s. villus)- This gives a greater surface area for more efficient diffusion of products into the bloodstream. 3. The small intestine has a RICH BLOOD SUPPLY - Each villus has a network of capillaries so that the products of digestion are carried away from the small intestine efficiently. 4. The epithelium of the small intestine in the villi is only ONE CELL THICK - for easier diffusion of the products of digestion into the bloodstream. The walls of the capillaries are only one cell thick as well!!
1. The small intestine is LONG- this ensures food remains in the small intestine long enough for the products of digestion to be fully absorbed into the bloodstrem. 2. The Small intestine is HIGHLY FOLDED into villi (s. villus)- This gives a greater surface area for more efficient diffusion of products into the bloodstream. 3. The small intestine has a RICH BLOOD SUPPLY - Each villus has a network of capillaries so that the products of digestion are carried away from the small intestine efficiently. 4. The epithelium of the small intestine in the villi is only ONE CELL THICK - for easier diffusion of the products of digestion into the bloodstream. The walls of the capillaries are only one cell thick as well!!
The cells lining the proximal tubules of the nephrons have a highly folded cell membrane on the lumen side of the tubule made of microvilli. This is referred to as a brush border and is important in increasing the surface area for reabsorption of components of the filtrate as it passes down the nephron.
The cell surface which lines the intestines have villi and microvilli. These are finger-like protrusions which increase the surface vastly.
The large intestine primarily operates to reduce water concentration in waste. The intestine is somewhat like the Golgi body in that it is folded over numerous times to increase surface area. In the Golgi, this allows for signaling with enzymes and other cellular proteins. In the intestine, it allows for increased access to digestive absorption.
The surface area of a cell is defined as the total area encompassing the perimeter of the outer cell layer. The surface area of a cell is an important part of the Surface Area to Volume Ratio in terms of the effect it has on molecules that are entering or exit the cell.