One of the central problems facing higher animals is that cells require a continuous source
of energy; however, it is impractical for organisms to meet this need by supplying a constant
external source of calories. Two specialized tissues, brown and white adipose tissues, have
evolved to meet the ongoing requirement for energy. White adipose tissue is able to store
excess calories in the form of triacylglycerol. When cells require energy, such as during
periods of fasting, these needs are largely met by fatty acids and glycerol formed from …