Question

You eat a piece of fatty foods. Describe the digestion (chemical, mechanical) that occurs in the mouth, stomach and intestines. Include a comment on CCK, bile and enzymes from the pancreas. Also talk about absorption into the blood/lacteal. Lots to this answer!

Answer 1

Mouth -

Area	Juice	Enzyme	Substrate	End product
Mouth	saliva	Lingual lipase	Triglycerides	Fatty acid
Stomach	Gastric Juice	Gastric Lipase	Triglycerides	fatty acids
Small Intestine	Pancreatic Juice	Pancreatic Lipase	Triglycerides	monoglycerides
		Cholesterol Ester Hydrolase	Cholesterol ester	free cholesterol
		Phospholipase a	Phospholipids	Lysophospholipids
		Phospholipids b	Lysophospholipids	phosphoryl choline
		Colipase	Facilitates action Of pancreatic lipase
		Bile salt activated lipase	Phospholipids	lysophospholipids
		Bile salt activated Lipase	Cholesterol ester	cholesterol and fatty acids
	Succus entericus	Intestinal Lipase	Triglycerides	Fatty acids

Cholecystokinin

Secreted by I cell of small intestine

Functions - contracts gall bladder, stimulates pancreatic secretion with enzymes.

Absorption in to blood -

1, in the mucosal cells, monoglycerides are converted to triglycerides. triglycerides are formed by re esterificationof fatty acids more than 10 to 12 carbon atoms. These triglycerides and cholesterol esters are coated with a layer of protein, cholesterol and phospholipid to form particles sizes called chylomicrons. Chylomicrons are very large size . So doesn't pass through the membrane of blood capillaries. So they enters the lymph vessels and then transferred to blood.

2. Fatty acids less than 10 to 12 carbon atoms enter the portal blood from mucosal cells.

Transport of lipids in blood is through lipoproteins.