The main roles of mitochondria are energy conversion, participation in the tricarboxylic acid cycle, and storage of calcium ions. 1. Energy conversion. Clinically, mitochondria is mainly a cellular organelle covered by two membranes, which can produce energy in the cell and is the main place for aerobic respiration in the cell. They are usually able to oxidize sugars, fats and amino acids and release energy, so they play the role of energy conversion in the metabolism of the human organism. 2. Participate in the tricarboxylic acid cycle. Usually pyruvate generated after glycolysis can be actively transported across the mitochondrial membrane to enter the mitochondrial matrix, where the mitochondria will oxidize pyruvate and combine it with coenzyme A to generate carbon dioxide, tricarboxylic acid and other substances. 3. Storage of calcium ions. Normally, mitochondria have the function of storing calcium ions, which mainly works with the endoplasmic reticulum and extracellular matrix to store calcium ions, so that the concentration of calcium ions in the cell is in a dynamic equilibrium state. Problems with mitochondria may lead to metabolic dysfunction and prompt medical attention is recommended.