Question

explain how proteins that are eaten are assimilated into the blood. Using a piece of meat as an example,
Answer should include mechanical reduction in particle size, digestion and absorption. A BIT OF DETAIL REQUIRED MOSTLY ON MECHANISM

Answer 1

• In the mouth , a piece of meat is breakdown into small pieces by chewing .
• From there it is passed through esophagus by peristalsis into stomach.
• In stomach chemical digestion of protein occur .Hydrochloric acid in the stomach maintain acidic environment in stomach and pepsin enzyme breakdown large protein into smaller chain of amino acid with peptide bond.
• Polypetides then passed into small intestine , where action of different type if pancreatic enzyme like trypsin , chymotrypsin and procarboxy peptidase occurs.
• Bicarbonate in the small intestine make small intestine alkaline, where more enzyme act on polypetides.
• Large polypeptides are then converted into tripeptides , dipeptides .
• These dipeptides and tripeptides are transported into mucosal cell by different type of protein transporter and convert this into single amino acid.
• Amino acid from the mucosal cell then pass into blood and then into liver , where regulation of aminoacid occur.It distribute amino acid according to the need of different body parts.
• Some amount of dietary protein which  are excreted through feces