Breakdown Of Food Flashcards
What are proteins broken down into?
Amino acids
What are carbohydrates broken down into?
Sugars
What are lipids broken down into?
Glycerol and fatty acids
How s glucose converted to pyruvic acid?
Glycolysis forming glyceraldehyde 3 phosphate which is converted to pyruvic acid
Converted to acetyl coA which enters the krebs cycle
How is starch/glycogen broken down?
Amylase breaks it down into maltose/sucrose/lactose
How is maltose broken down?
By maltose to form glucose
How is sucrose broken down?
By sucrase to form glucose+fructose
How is lactose broken down?
By lactase to for glucose and galactose
How are carbohydrates absorbed?
Na+/glucose transport
Glucose/galactose moves into cell with one Na+
Na+ leaves cell and is exchanged for K+
However, fructose moves in via GLUT5 and leaves via GLUT2
How is fructose absorbed?
Moves in via GLUT5 and out via GLUT2
How are proteins broken down?
Broken down by pepsin and pancreatic proteases
Exogenous proteins -> di and tri peptides
Endogenous proteins -> amino acids
How are di and tri peptides absorbed?
Through PEPT1 then move out of cell not capillary through Na+ independent channels
How are amino acids transported?
Through Na+ dependent or independent channels then into capillary through Na+ independent channels
What produced trypsinogen?
Pancreatic zymogens
What activates trypsinogen to form trypsin?
Enterokinase (brush border)
How are lipids digested?
Large lipid droplet is mixed and bile salts are added forming micelles.
Pancreatic lipase digests them to form fatty acids and monoglycerides