LIPIDS - Definition,Classification,Functions

 Definition - 

• Lipids are small inorganic compounds insoluble in water but soluble in non - polar solvents like chloroform,ether etc.

Classification - 

Functions of Lipids -

• Serve as Metabolic Fuels -  amount of energy obtained – 9 kcal/g
• Provide Cushioning effect to internal organs
• Form Structural component of biomembranes – Phospholipid bilayer of cell membrane
• Subcutaneous fat as thermal insulator
• Helps in formation of surfactant
• Improves taste of food
• Helps in absorption of fat soluble vitamins A,D,E,K
• Gives shape & contour to body
• Sphingomyelins – act as insulator in myelin sheath
• Precursor  for the synthesis of many compounds (cholesterol) - steroid hormones, bile salts,Vitamin D
• Lipoproteins - help in transport of Lipids