These are not necessarily the mechanisms, but I believe you are referring to active and passive transport. Active transport uses energy (from adenosine triphosphate, or ATP) to move solutes from an area of low concentration to an area of high concentration This movement is against the concentration gradient, so energy is required. Passive transport is when the solutes basically fall from an area of high concentration to an area of low concentration across a membrane. Since solutes naturally seek to equalize concentration across a membrane, no added energy is required for passive transport.
osmosis and diffusion
when something can enter or exit the cell
electrodes.
This part of the cell is refferred to as the cell 'membrane'
. . . . . .
Sometimes the cells exit the cell cycle (usually from G 1 phase) and enter the G 0 phase.
Osmosis
The selective permeability, also called semi-permeability, of the membrane controls which substances cant enter and exit the cell.
selective permeability
selective permeability
selective permeability
Osmosis
selective permeability
Cell membrane
The small openings in the nuclear envelope that regulate what substances enter and exit the nucleus are called nuclear pores. A process of depositing a vesicle's contents outside the cell is exocytosis.
The cell membrane controls selective permeability. Larger substances can enter the cell through endocytosis and exit through exocytosis.
It controls the entry and exit of substances.
Selective permeable