When educating students about the differences between brown fat versus white fat, the instructor will share that brown fat has iron in its mitochondria that will facilitate:
A) Production of a protein that releases the energy generated from metabolism as heat
B) The primary function of storing fat energy
C) Insulation and cushioning of the body's vital organs
D) Concentration of the fat tissue in the greater omentum and around the kidneys
Ans: A
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Brown fat differs from white fat in terms of its thermogenic capacity (its ability to produce heat). The color of brown fat reflects the presence of iron in its abundant mitochondria. Brown fat mitochondria produce a specific protein called uncoupling protein-1 (UCP-1) that releases the energy generated from metabolism as heat. The functions of white fat include energy storage, endocrine and adipocytokine secretion, insulation, and cushioning of vital organs. Internally, white adipose tissue is preferentially located in the greater omentum, mesentery, and retroperitoneal space and is usually abundant around the kidney.
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