7.3 Protein: Digestion and Absorption

7.3 Protein: Digestion and Absorption


– WELCOME TO THE THIRD SECTION
IN OUR SERIES ON PROTEIN. THIS SECTION IS COVERING
THE DIGESTION AND ABSORPTION OF PROTEIN. NOW, THIS SECTION IS
GOING TO BE SHORT AND I’M JUST GOING
TO COVER THE BASIC ASPECTS OF PROTEIN DIGESTION
AND ABSORPTION. REMEMBER, DIGESTION IS
THE BREAKDOWN OF FOOD INTO INDIVIDUAL
NUTRIENTS. AND ABSORPTION IS TAKING
THOSE NUTRIENTS, THOSE INDIVIDUAL NUTRIENTS, AND PULLING INTO THEM
INTO THE BLOODSTREAM. WE’RE GOING TO START
WITH PROTEIN. AND REMEMBER, THIS IS OUR VERY
COMPLEX PROTEIN STRUCTURE COILED AND FOLDED ON ITSELF. AND ONCE THE PROTEIN GOES
INTO THE STOMACH, THERE IS A VERY LOW PH,
AS I MENTIONED BEFORE. PH OF 2 IS NECESSARY
TO UNCOIL THAT PROTEIN. SO ALL OF THESE COILS HERE
ARE BASICALLY WILL UNCOIL, THEY’RE UNFOLDED, AND YOU END UP
WITH THIS STRAND OF AMINO ACIDS. NOW REMEMBER, EACH OF
THESE CIRCLES REPRESENTS JUST ONE AMINO ACID. SO THIS IS A STRING
OF AMINO ACIDS. AND IN ADDITION TO THAT THERE’S
ACTUALLY AN ACID-STABLE PROTEIN, PEPSIN, WHICH EXISTS
IN THE STOMACH AND THAT CAN CLEAVE
THE REALLY LONG CHAINS OF PROTEIN
DOWN INTO SMALLER POLYPEPTIDES. NOW, ONCE IT GOES
FROM THE STOMACH INTO THE SMALL INTESTINES, THERE ARE ENZYMES RELEASED
FROM THE PANCREAS AND THE INTESTINAL LINING,
LIKE I MENTIONED EARLIER. THESE ENZYMES WILL TAKE
THE POLYPEPTIDE CHAIN AND BREAK DOWN
THAT CHAIN OF AMINO ACIDS INTO SMALLER DIPEPTIDES
AND TRIPEPTIDES. SO THESE ARE JUST– THIS IS JUST A
TWO-AMINO ACID UNIT. AND THIS IS A
THREE-AMINO ACID UNIT. ENZYMES AGAIN WILL
THEN BREAK DOWN THESE DI- AND TRIPEPTIDES INTO
INDIVIDUAL AMINO ACIDS. NOW, ONCE YOU HAVE THESE
INDIVIDUAL AMINO ACIDS, THIS IS IN THE– OR, YOU KNOW, THIS
IS THE INTESTINES, THIS IS THE INTESTINAL
CELLS AND THEN THEY’RE ATTACHED
TO THE BLOODSTREAM. ONCE THE AMINO ACID GO FROM THE
PROTEIN TO BE UNCOILED TO THE POLYPEPTIDE TO THE DI-PEPTIDE,
TRIPEPTIDE, AND THEN BECOME THESE
INDIVIDUAL AMINO ACIDS THEY ARE THEN ABSORBED
INTO THE BLOODSTREAM. SO ACROSS THE INTESTINAL CELL
LINING AND INTO THE BLOODSTREAM. AND THAT IS THE
END OF OUR SECTION ON DIGESTION AND
ABSORPTION OF PROTEIN.  

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