Organ or gland Secretion Enzymes Substrate Product Liver
Bile Pancreas
Small intestine (ileum)
Pancreatic juice Intestinal juice
Lipase Lipase
Large fat molecules
Lipids Lipids
Absorption and utilisation of lipids
After digestion the fatty acids and glycerol are ready to be absorbed by the small intestine. They pass through the wall of the villi into lacteals, which form part of the lymphatic system.
Blood Villi Villi and lacteals Intestine capillaries Lacteal Villi
Emulsified fat (small molecules)
Fatty acids and glycerol Fatty acids and glycerol
The lymphatic system transports the digested lipids to the thoracic duct, where they are deposited into bloodstream through the subclavian vein (near the left side of the neck).
Subclavian vein
Thoracic duct
Subclavian vein and thoracic duct HL
• In the liver and muscles, digested lipids are oxidised to produce heat and energy and form cell membranes. • Excess digested lipids are stored as adipose tissue under the skin to insulate the body and act as an energy reserve.
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Complete the following table in relation to the digestion of lipids. Digestive gland Pancreas
Secretion Enzyme
Complete the following table in relation to the digestion of lipids. Digestive gland Small Intestine
