QS Study

Absorption of Protein

Protein is one of the most important substances in our body. Our muscles, hair, eyes, organs, and many hormones and enzymes are primarily made out of protein. Protein absorption also happens in your small intestine, which contains microvilli. These are small, finger-like structures that increase the absorptive surface area of your small intestine. This allows for maximum absorption of amino acids and other nutrients. The body uses the transporter protein transport system to absorb amino acids. Each amino acid group has a carrier protein that is accountable for transporting it from the intestines to the mucosa cells.

  • It is an active process that needs energy.
  • The energy needed is derived from hydrolysis of ATP.
  • It occurs in the small intestine.
  • Absorption of amino acids is rapid in the duodenum and jejunum but slow in the ileum.

Fig: Absorption of Protein

Most of the proteins are absorbed in the form of amino acid and some in the form of di and tripeptides. Seven different types for protein absorption, among these, 5 types are Na+ dependent and other two are Na+ – independent.

Na+ dependent –

  • Neutral amino acid
  • Basic amino Acid
  • Acidic amino acid
  • Imino Acid.

Na+ Independent

  • Neutral amino acid
  • Lipophilic amino add