Cell Membrane Transport (Passive & Active) Diffusion, Osmosis, Hydrostatic Oncotic Pressure Colloid

Cell membrane transport: passive and active transport including simple diffusion, facilitated diffusion, osmosis, active transport along with water and solute movement through capillary wall: hydrostatic and oncotic pressure (colloid osmotic pressure).

Forms of passive transport include: simple / facilitated diffusion and osmosis.

Simple diffusion is the movement of solutes from a high concentration to a low concentration (requires no energy or help from channel proteins). Facilitated diffusion is like simple diffusion, but it uses channel proteins to move solutes.

Osmosis is the movement of water from a high concentration of water to a low concentration of water, or in other words, water moves from a low solute concentration to a high solute concentration.

Active transport is a process that uses energy in the form of ATP to movement solutes from a low concentration to a high concentration gradient (against the concentration gradient) via channel protein proteins.

In order to movement water and solutes through the capillary wall, the body uses hydrostatic and oncotic pressure (also called colloidal osmotic pressure).

Hydrostatic pressure is the pushing effect on water through the capillary wall and leads to filtration. While oncotic pressure is the pulling effect on water through the capillary wall and helps keep water in the plasma (intravascular compartment). This process is highly influenced by albumin (a colloidal).


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