| MadSci Network: Anatomy |
Daniel; your question is a common one-even my college students ask it sometimes. A little background is necessary to answer it. There are 4 basic kinds of tissue in the human body; epithelium, connective, muscle and nervous. There are several sub types in several of these basic types such as fat (adipose) tissue being a sub type of connective and skeletal muscle being a special type of muscle tissue. So, when one works out, their muscle cells get bigger and stronger. (they don't make more cells!) At the same time, they may be using some of their stored energy as a source of the energy to do this working out. That of course would depend on their diet etc. but most times, stored fat would be used up. The fat cells store fat (lipid) in a large vacuole inside each cell, so when the energy is used, the fat dissapears when it is being metabolized. The fat cell dosen't dissapear, it only gets smaller. So, your muscles get bigger and your fat cells get smaller, but they do not BECOME the other type of tissue. They always remain the same type of cell. Since muscle is heavier that fat, you may actually weigh more after getting more muscular but you will be stronger and burn your food more efficiently than when your fat cells were larger. I hope this answers your question. It was a great one for some one your age. J. Bridger
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