Question 2 (20 pts) This question is in part based on your Reading \"Adipose Tis

Question

Question 2 (20 pts) This question is in part based on your Reading "Adipose Tissue". "Fat is bad" is a common theme in today's culture and there is some truth to that. However, fat is also an integral part to a fully functioning organism. Please describe the histological appearance of the three types of adipose tissue described in your Reading and provide a function for each of them. Please speculate how evolutionary pressures may have affected the development and presence of these adipose tissues in different organisms and during different life stages. Feel free to reference your reading assignment and other sources but avoid extensive quotes-they are bad style and will not be considered part of "your" answer -paraphrase and cite instead (see your Plagiarism Exercise to see the difference between quoting and paraphrasing).

Explanation / Answer

The three types of adipose tissue are tissue containing brown adipocyte, beige adipocyte and white adipocyte.

Histologically, the white adipocyte are mainly fat storing cells. They contain large central lobule containing fat with a peripheral nucleus and mitochondria.

The beige adipocyte stain lighter than the brown adipocyte. The have lesser number of mitochondria and large, numerous and dispersed fat globules.

The brown adipocytes stain darker, have smaller fat globules but more in number than beige adipocytes and also have more number of mitochondria. The nucleus is peripheral.

The development of these adipocytes might have gone through a lot of changes during generations and evolution of species. The storage form of fats in all organisms is triglyceride. In invertebrates and lower animals they either stored as granules in dependent parts and were stored as the environmental need. Adipocytes always worked as stoarge units. The type of adipocytes varies. Let us consider a human being, with younger age there appear more brown cells producing more heat and energy and with age the number shifts to white cells. Along with inter species modulations, there also occur modulations with age in the same specie. The cells vary as per the organisms need and more importantly habitat.

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