They are used as anaerobic fuel when carbohydrates are low, or as aerobic fuel when lipid resources are also low.
Proteins in the body are used for many things. Including: 1.Energy for things like movement, to talk, to breathe. 2.Storage. Tis is stored and used for food for the cells. 3.To live. The brain and major organs also use the protein to absorb and operst properly. These are the uses of proteins in the body. There are many other uses for proteins, for example some of them can be used to transport material around the body and in or out of a cell. These are called carrier proteins. There are proteins in your blood and digestive system. Proteins are also the building blocks of life. Our muscle cells, for example contain a lot of protein. Proteins are also used by the cell to package the DNA into compact structures called chromosomes. Proteins are used by organisms to make such things like hair, nails, rhino horns, feathers, scales, the beaks of birds, and procupine quills, among other things. Source(s): Proteins have nitrogen, oxygen, hydrogen, and carbon. The use of a protein is to grow and repair the body. It is also used to create enzymes. They are a part of the building block molecules which include carbohydrates, lipids, and nucleic acids. Protein is an essential nutrient in any healthy diet. Proteins are used to repair the body. They are not used for energy unless there are not enough carbohydrates and fats present. However, many Americans eat more protein than they need. People who have kidney problems may be advised to limit the amount of protein they eat. Protein is one the three macronutrients: carbs, proteins, and fats which yield energy for the body. Proteins yield 4 calories per gram and is mainly used in rebuilding your bodies daily breakdown from stress applied on it. Each bead is a small molecule called an amino acid. There are 20 standard amino acids, each with its own shape, size, and properties. Proteins typically contain from 50 to 2,000 amino acids hooked end-to-end in many combinations. Each protein has its own sequence of amino acids. Proteins are made of amino acids hooked end-to-end like beads on a necklace. To become active, proteins must twist and fold into their final, or native, conformation.. This final shape enables proteins to accomplish their function in your body.  Proteins also have structural or mechanical functions, such as actin and myosin in muscle and the proteins in the cytoskeleton, which form a system of scaffolding that maintains cell shape. Other proteins are important in cell signaling, immune responses, cell adhesion, and the cell cycle. Proteins differ from one another primarily in their sequence of amino acids, which is dictated by the nucleotide sequence of their genes, and which usually results in protein folding into a specific three-dimensional structure that determines its activity. A linear chain of amino acid residues is called a polypeptide. A protein contains at least one long polypeptide. Short polypeptides, containing less than 20-30 residues, are rarely considered to be proteins and are commonly called peptides, or sometimes oligopeptides Proteins are molecules made of amino acids. They are coded for by our genes and form the basis of living tissues. They also play a central role in biological processes. For example, proteins catalyse reactions in our bodies, transport molecules such as oxygen, keep us healthy as part of the immune system and transmit messages from cell to cell. The individual amino acid residues are bonded together by peptide bonds and adjacent amino acid residues. The sequence of amino acid residues in a protein is defined by the sequence of a gene, which is encoded in the genetic code. Proteins differ from one another primarily in their sequence of amino acids, which is dictated by the nucleotide sequence of their genes, and which usually results in protein folding into a specific three-dimensional structure that determines its activity. A linear chain of amino acid residues is called a polypeptide. A protein contains at least one long polypeptide. Short polypeptides, containing less than 20-30 residues, are rarely considered to be proteins and are commonly called peptides, or sometimes oligopeptides Proteins are believed to increase performance in terms of athletics. Amino acids, the building blocks of proteins, are used for building muscle tissue and repairing damaged tissues. Protein is only used as anaerobic fuel when carbohydrates are low, or as aerobic fuel when lipid resources are also low. Proteins are essential nutrients for the human body. They are one of the building blocks of body tissue, and can also serve as a fuel source. As a fuel, proteins contain 4 kcal per gram, just like carbohydrates and unlike lipids, which contain 9 kcal per gram.
https://answers.yahoo.com/question/index?qid=20080309081028AAlN1V1 https://answers.yahoo.com/question/index?qid=20090930195353AA70Tv4 https://www.sharecare.com/health/protein-body-impact/how-protein-used-body http://publications.nigms.nih.gov/structlife/chapter1.html https://en.wikipedia.org/wiki/Protein http://sciencelearn.org.nz/Contexts/Uniquely-Me/Science-Ideas-and-Concepts/Role-of-proteins-in-the-body https://en.wikipedia.org/wiki/Protein https://en.wikipedia.org/wiki/Protein_%28nutrient%29
what are proteins used for