Describe about nutrition in human being

The human being has a heterotrophic nutrition. Nutrition is realised by digestion. Digestion can be either intracellular or extracellular. Intracellular digestion occurs for example when white blood cells consume pathogens or dead tissue. Extracellular digestion occurs in the digestive tract. Digestion can be either mechanical(chewing) or chemical(hydrolysis-a process in which for every broken bond a water molecule is added).

The main types of nutrients are:

Carbohydrates that are mainly used for energy. In the digestive tract there are different enzymes that hydrolyse the carbohydrates to monosaccharides.

Carbohydrate(enzyme)--->monosaccharide

Proteins play an important structural and functional role in the body. There are specific enzymes that digest them. They are broked down to amino acids.

Protein(enzyme)>amino acid

Lipids store energy. There are enzymes that break lipids down to fatty acids and glycerol.

Lipids(enzyme)--->fatty acids+glycerol

Vitamins help the metabolism and are not chemically processed in the digestive tract nor are minerals or water.

cellular respiration oxidizes food into energy in the form of atps.

glycolysis (6 c hexose) > 2x atps are used > 6c hexose biphosphate > 2 x 3c triphosphate >

2 x 3c pyruvate (2x nadh produced from nad) and (4x atp produced)

pyruvate actively pumped mitochondrial matrix.