what is absorption? And explain the human process
Answers
The process through which the end products of digestion are absorbed into the blood or lymph from the intestinal mucosa is called as Absorption. This process occurs either by the passive, active or facilitated transport mechanisms in the body. The small intestine is the organ where absorption occurs. It is specially adapted to carry out this function.
Process of Absorption
The process through which the end products of digestion are absorbed into the blood or lymph from the intestinal mucosa is called as Absorption. This process occurs either by the passive, active or facilitated transport mechanisms in the body. The small intestine is the organ where absorption occurs. It is specially adapted to carry out this function.
Absorptive area of the Small Intestine
The huge absorptive surface area of the small intestine is due to the presence of the mucosal folds, villi, and microvilli. These are the three distinguishing features of the small intestine. The rest of the structure is similar to the other areas of the alimentary canal.
The villi and microvilli are exposed to the intestinal lumen. The vast microvillar surface creates a brush border. This increases the rate of nutrient absorption to a great extent. Through the epithelium of the villi, the digested food molecules pass from the lumen of the intestine to the blood capillary network or lacteals.
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