There are the following ways for substances to enter the cell:
1) Phagocytosis – absorption, capture of solid particles by the cell membrane and their subsequent digestion.
2) Pinocytosis – the absorption of fluids by the cell membrane;
3) Diffusion and osmosis are the processes of substances from a region with a higher concentration to a region with a lower concentration. A special case of osmosis is the penetration of substances through a semipermeable membrane.
4) Active transport – the transfer of substances against the concentration gradient, which occurs with the expenditure of energy.
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.