In what ways do substances enter the cell? What is the mechanism of their receipt?

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.

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