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ABSORPTION

Food & Nutrition

The process by which the end products of digestion pass through the lining of the digestive tract is called absorption. Absorption takes place through the inner lining of the small intestine called villi. the simple sugar and amino acids enter into the blood directly while the fatty acids enter the blood system indirectly through the lymphatic system.

Site Digestive juice Optimum pH Enzyme Functions (reactions)
Mouth Saliva Alkaline Ptyalin Starch          maltose
Stomach Gastric juice Acidic (due to the presence of hydrochloric acid) Pepsin

 

Renin

Converts protein to peptide and peptone.

Acts on milk proteins only and curdles it by converting the caseinogen (soluble) to casein (insoluble)

Duodenum Bile secreted by the gall bladder

Pancreatic juice produced by the pancreas

Alkaline

 

Alkaline

 

 

Contains no enzyme but bile salts amylase

Trypsin lipase

The bile salts emulsify the fats.

 

Starch                               maltose

Protein           peptides/peptones

Fats                         fatty acids and                                  glycerol

Small intestine or ileum Intestinal juice Alkaline Maltase

Lactase

Sucrose

Peptidase

Lipase

 

 

 

 

 

 

Assignment: draw and label fully a diagram showing the alimentary canal.

 

Note

THE DIGESTIVE SYSTEM

DIETARY DEFICIENCY

MINERAL ELEMENTS

Vitamins

FATS AND OILS

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