Substances can enter the cell by simple and facilitated diffusion without energy consumption, in the direction where a lower concentration of these substances is observed. Simple diffusion and facilitated diffusion are varieties of passive transport. Also, substances can enter through endocytosis) – the absorption of external particles by a cell through the formation of membrane vesicles. With endocytosis, a specific section of the plasmalemma envelops the extracellular material and captures it, enclosing it in a membrane package.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.