Organelles are structures within the cell that have a certain form and function, such as mitochondria, endoplasmic reticulum, and microtubules, microfilaments, and centrosomes. Mitochondria play the role of oxidative energy supply in the cell; endoplasmic reticulum is divided into rough endoplasmic reticulum and slippery endoplasmic reticulum, rough endoplasmic reticulum outside the attachment of granular ribosomes, slippery endoplasmic reticulum surface smooth, no ribosomes attached, slippery endoplasmic reticulum has a complex function, involved in the metabolism of glycogen and lipids, and can generate steroids hormones, the rough endoplasmic reticulum is the place of protein synthesis; microtubules and microfilaments in the electron microscope They can be seen, microtubules have a certain degree of toughness and elasticity, microfilaments have contractile movement, microfilaments mainly play a supportive role for the cell. In addition, it is related to the direction of movement of chromosomes during cell division.