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Movements across the cell membrane - Coggle Diagram
Movements across the cell membrane
Endocytosis
method of taking materials into the cell
a vesicle is formed by pinching off a small piece of the plasma membrane
contains materials (water and solutes) and molecules (too big to pass through the plasma membrane) that were outside the cell
Exocytosis
method of taking materials out the cell
the fusion of a vesicle with the plasma membrane
the contents are then outside the membrane and therefore outside the cell
Diffusion
Simple diffusion
movement of particles between the phospholipids in the membrane
non-polar and small particles can diffuse more easily
passive process
Facilitated diffusion
movement of ions or polar molecules across a membrane through protein channels
passive process
Osmosis
net movement of water molecules through a permeable membrane
passive process
Active transport
the absorption of substances against the concentration gradient
carried out by globular proteins in membranes → pump proteins
allow the cell to control the content of its cytoplasm precisely
energy is needed → not a passive movement
ATP acts as the energy supply → every cells produces it by cellular respiration