Mitochrondria of the eukaryotic cells.
<span>As many researchers hypothesize that the old single-celled organism or the origin of the complex-celled organisms came from the endosymbiosis of the mitochrondrion organism and the prokaryotic cell. It has been said that mitochondria was an independent organism which then to have been evovled itself after planting itself inside a prokaryotic cell which aided cellular respiration and production of ATP (Adenosine Triphosphate). This then aided the prokaryotic cell to be more sophisticated and caused another change from having without a true nucleus to a eukaryotic cell with a nucleus and embedded DNA. </span>
Aerobic respiration to lactic acid fermentation, lactic acid is the reason your muscles get sore after a workout
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This is most likely due to the fact that people with AIDS have supressed immune systems. Those with AIDS suffer from a suppressed immune system, making it much more likely for them to catch illnesses and increasing the severity of the affliction.
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The nervous system sends messages to organs and tissues :) Hope this helps!