Organic molecules (lipids)

Lipid

• not water soluble

• non polar molecules

ENERGY SOURCE; ENERGY STORAGE; INSULATION; STRUCTURAL COMPONENTS; CHEMICAL MESSENGERS; PROTECTION;

Bile acids

steroids that aid in fat digestion and nutrient absorption

Cholesterol

Component of cell membranes; precursor of other steroids

fat-soluble vitamins

involved in variety of functions including blood clotting, wound healing, vision, and calcium absorption

fatty acids

precursor of triglycerides; source of energy

phospholipids

major component of cell membrane; aid in fat digestion

• semi permeable

• hydrophilic heads

• hydrophobic tails

steroid hormones

chemical messengers between cells

• made from cholesterol

triglycerides

energy storage: thermal insulations; filling space; binding organs together; cushioning organs

Saturated

no double bonds between carbons

Unsaturated

has double bond between carbons

Eicosanoids

a family of lipid signaling molecules derived from 20-carbon polyunsaturated fatty acids, primarily arachidonic acid