There are four different types of passive transport: diffusion, facilitated diffusion, filtration and osmosis. Diffusion is the movement of substances from an area of high concentration to an area with lower concentration. The difference of concentration between these two areas is called concentration gradient.Know More
Diffusion is described as moving substances down the concentration gradient. This differs with active transport, which moves substances from a low concentration area to a higher one, a process referred to as moving substances against the concentration gradient.
Osmosis, on the other hand, is a type of diffusion whereby water molecules move through a cell membrane from a hypotonic solution to a hypertonic solution. A hypotonic solution is a solution with a low concentration of solutes, whereas a hypertonic solution has a high concentration of solutes.
Another passive process is filtration, which is the movement of solute molecules and water across the cell membrane by normal cardiovascular pressure. Certain functions of the kidneys and liver are based upon filtration. With facilitated diffusion, movement of molecules across the cell membrane occurs through carrier proteins, which are embedded in the cell membrane. The solutes in facilitated diffusion move down the concentration gradient and do not use energy to move.Learn more about Cells
The major difference between active and passive transport is that passive transport does not require the application of external energy, while active transport does. Both processes move molecules across the cell membrane, but passive transport always takes advantage of existing concentration gradients to allow a natural diffusion of molecules.Full Answer >
Some examples of active transport are endocytosis, exocytosis and the use of a cell membrane pump; diffusion, osmosis and facilitated diffusion are all examples of passive transport. In active transport, particles move from areas of low concentration to high concentration, while in passive transport, the particles move from areas of high concentration to areas of low concentration.Full Answer >
Facilitated diffusion is considered passive transport because substances pass through a cell membrane with the assistance of a protein carrier, and no cellular energy is used in this process. Solutes use facilitated diffusion to move from areas of higher concentration to areas of lower concentration.Full Answer >
The main types of cellular transport are passive transport and active transport. Passive transport occurs spontaneously through diffusion, which is the movement of chemicals across the cell membrane from regions of higher concentrations to lower ones. Active transport requires energy and involves special proteins called pumps and transporter proteins.Full Answer >