Organelles are structures in cells with certain forms and functions, such as mitochondria, endoplasmic reticulum, microtubules, microfilaments, and centrosomes. Mitochondria play the role of oxidative energy supply in the cell; endoplasmic reticulum is divided into rough endoplasmic reticulum and smooth endoplasmic reticulum, the rough endoplasmic reticulum has granular ribosomes attached outside, smooth endoplasmic reticulum surface, no ribosomes attached, smooth endoplasmic reticulum has complex functions, involved in the metabolism of glycogen lipids, can produce steroid-like hormones, rough endoplasmic reticulum is the synthesis of proteins; microtubules and microfilaments under the electron microscope They can be seen under the electron microscope, microtubules have some toughness and elasticity, microfilaments have contractile movements, and microfilaments mainly play a supporting role for cells. In addition, they are related to the direction of chromosome movement during cell division.