Answer: Protein is the nutrient that is used in building, repairing, and maintaining body tissues.
Every tissue and fluid in the body contains protein except bile and urine.
A protein is made up of amino acids, carbon, hydrogen, carbohydrates, and oxygen.
Functions of proteins:
The digestive enzymes are made up of proteins that are useful in carrying out digestion.
The protein acts as a chemical messenger for the interaction between cells, tissues, and organs.
Regeneration and creation of DNA molecules are done with the help of proteins.
Receptors are made up of proteins that help in the interaction of a cell with other cells and the external environment.
The immune system uses antibodies for repairing body cells which are mainly made up of proteins.