urea is final product of catabolism of.. amino acid

urea is final product of catabolism of:
- amino acid***
- triglyceride
- cholesterol
- polysaccharide.
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Amino acids are organic substances that have in their constitution two different functional groups: one carboxyl (referring to carboxylic acids) and one amino (referring to amine).
In the structure of an amino acid, the amino group and carboxyl are not directly linked. In fact, they are linked indirectly because the amino group is always linked to the number 2 carbon of the chain.
Generally, an amino acid is referred to as α-amino acid. The term alpha indicates that the amino group in any amino acid is bonded to carbon 2 from the carboxyl.
The union of two or more α-amino acids leads to the formation of proteins, macromolecules that perform several important functions for an organism. Among the functions of proteins, we can mention:
- Structural: construction of tissues in the body, such as muscle;
- Enzyme: formation of enzymes that act on chemical reactions;
- Defense: in the formation of antibodies;
- Transport: transport of triglycerides and cholesterol, for example;

Amino Acid Types:
There are 20 common α-amino acids: alanine, arginine, aspartate, asparagine, cysteine, phenylalanine, glycine, glutamate, glutamine, histidine, isoleucine, leucine, lysine, methionine, proline, serine, tyrosine, threonine, tryptophan and valine.
However, of these amino acids, the human body cannot synthesize (produce) nine of them: histidine, lysine, leucine, methionine, isoleucine, phenylalanine, threonine, tryptophan and valine. For this reason they are called essential amino acids and must be obtained in the diet. The other 11 are produced by the body itself and are called non-essential amino acids.
In food, amino acids are present in the form of proteins. When consumed, our bodies break down protein molecules in digestion, thus favoring the use of amino acids specifically.

Amino Acid Sources:
Here is a list of foods that contain proteins, ie amino acid sequences:
- Beef;
- Pig meat;
- birds;
- Fish;
- Eggs;
- rice;
- Wheat;
- corn;
- Lentil;
- Chestnuts (almonds, peanuts, Brazil nuts, cashews, etc.);
- Milk and its derivatives (yogurt, cheese, etc.).

Importance of Amino Acids:
Specifically, essential amino acids are important to our body because they participate in:
- Production of red blood cells;
- antibody production;
- Production of important hormones, such as serotonin;
- Cell regeneration (skin, for example);
- Promoting the feeling of satiety in the brain after eating.