Bosh miyaning tuzilishi

By taking up nourishment or nutrients (proteins, fats, carbohydrates,

vitamins, minerals, and trace elements) the body can create energy by

the “combustion” of nutrients to maintain its organization (structure,

catabolic, or energy metabolism) and the functions derived from it

(growth, renewal of cells, body temperature, mechanical and chemical

work). The nutrients are degraded by the enzymes of the digestive

glands in the various divisions of the digestive system, broken down

into chemical combinations that can be absorbed, and taken up (resorbed)

by the gastrointestinal mucosa. These energy-rich combinations

(e. g., fatty acids, amino acids, or glucose) enter the bloodstream

and next reach the liver by way of the portal vein (see Liver, Function