Lipids

• Lipids: composed of Carbon, Hydrogen, and Oxygen (C, H, O)
• Condensation reaction between glycerol and fatty acids forms triglycerides
• How lipids are formed

  They form ester bonds

  
• Phospholipids contain:

  • Phosphate heads
  • Fatty acid tails
  • One of the fatty acids is substituted by a phosphate group
  • The phosphate heads are hydrophilic (water-attracting)
  • The fatty acid tails are hydrophobic (water-repelling)
• Phospholipids are a type of lipid with both hydrophilic and hydrophobic components
• Cholesterol is a lipid that interacts with bile salts in the digestive system due to its hydrophobic nature and the hydroxyl group, which is hydrophilic, interacts with the heads of phospholipids
• Cholesterol is used to make steroid hormones, Vitamin D, and bile acids
• Cholesterol is hydrophobic due to its structure, making it interact with lipids in the body