The ileum is long to provide a large surface area for absorption of digested food.
The ileum is narrow to bring the digested food substances into close contact with the walls of the ileum for easier absorption.
The ileum is highly coiled to slow down movement of food thus allowing more time for absorption of digested food substances.
The ileum is coiled to increase the surface area for the absorption of digested food.
The ileum has a large number of villi and microvilli to increase the surface area for absorption of digested food.
The ileum has a thin layer of cells for easy and fast diffusion of digested food.
The ileum has a dense network of blood capillaries in the villi into which amino acids, sugars,vitamins and minerals are absorbed.
The blood capillaries also promote a steep diffusion gradient for efficient absorption of the digested food substances.
The ileum has lacteals in the villi for absorption of fatty acids and glycerol.
Faimus answered the question on December 3, 2017 at 12:55
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