Passive Transport | Diffusion, Facilitated Diffusion, Processes & Types

Passive transport
passive transport

Passive transport allows ions to move from higher concentration to the area of lower concentration. passive transport lets concentration do its work and passive transport permits molecular physical presence by orientation in cell membranes that passive transport do not require energy to pass molecules inside of membrane. Unlike Passive Transport the active transport, need the intake of power derived from the utilization of physical or chemical resources by cells. Four main kinds of passive transport are simple diffusion, facilitated diffusion, filtration, and/or osmosis.

Passive transport Letting Concentration Do the Work

In passive transport Cells do acquire some place/area so in passive transport it to be there and this is why their concentration level is high. In passive transport If you observe that Oxygen than its concentration. will be high at external part of cell body and it will be low inner side of cell body and these Oxygen molecules are small that they can easily enter the cell body and hence do not require energy for this reason. On the other hand Oxygen is necessary for cells for living but the fear factor is that some of molecules are small that can enter cell can also harm or kill Oxygen that is not good.

how concentration work in passive transport?
passive transport

Passive Transport Diffusion

In passive transport diffusion process, molecules tend to go where there is low concentration. Because of passive transport they travel along concentration gradient. In passive transport diffusion, without need of energy from cell diffusion stops when both the levels are equal.

Passive Transport Facilitated Diffusion

Passive Transport Facilitated diffusion is also called carrier-mediated osmosis. Passive Transport facilitated diffusion is a molecules transfer from one place to another by a special protein. In Passive Transport facilitated diffusion, protein included in membrane and there is no energy.

how facilitated diffusion works?
passive transport

Passive Transport Filtration

Passive Transport Filtration is form like previous and in this passive transport filtration form, the passive transport that really need no energy to travel. This also corresponds to the Water and Solute Molecules Movement.

how filtration works in passive transport
passive transport filtration

Passive Transport Osmosis

Passive Transport Osmosis is the travel of water molecules around membrane. In Passive Transport Osmosis, every part of area is balanced in water in passive transport osmosis if the solution is isotonic that meant that the water concentration is same is both area parts.

In a case of hypotonic, both the areas is not same. Movement of water is from High level of concentration to lower level of concentration.

Explanation of Osmosis in Passive Transport

Passive Transport having ability to scatter around and Passive Transport is property like for example you pour a drop of color in a coffee mug which it is having coffee in it, once you pour the drop, in this Passive Transport process the active transportation will start and that means that they will diffuse with the coffee molecules, you will see color of drop will eventually merging with color of coffee’s color. Passive Transport happens because the drop’s molecules move randomly and the diffusion takes place after their concentration gets equal, then movement of molecules of drop and coffee will be same once the diffusion takes place. That means that in Passive Transport, the molecules move from area of high concentration to the area of low concentration.

Osmosis in Passive Transport
passive transport concentration

Passive Transport  not need use of power, diffusion takes action because of diffusion and this is reason it does not require the energy to carry on the process and the membranes in Passive Transport are semi permeable, so rate of diffusion depends on the molecules itself. In Passive Transport with in water, the diffusion is quit fast and effect because the water diffuse through the semi permeable membrane quit quick and in case of Passive Transport in fluids, the rate of diffusion is little slow because of the slow movement of difference in properties of molecules.

Differences in Passive Transport and Active Transport

Unlike Passive Transport, AT Process is use the active transport pump to push the molecules from the low gradient’s concentration of solute to a solute where there is high level of gradient’s concentration and that is needed to carry out from energy processed in cells. But Passive Transport is works almost opposite and it works from the area where of higher concentration gradient to the area where is lower concentration gradient and hence do not requires energy. It goes from high to low concentration for maintaining equilibrium. Passive Transport allows the molecules transformation into membrane of cell facing gradient’s concentration so in the cell so that nutrients are remained inside of cellular body whereas the waste is remained outside. Passive Transport and Active Transport both are good because they maintain the states and allows not only the gases to come and get out but also establish the equilibrium between inner and outer state. Proteins, ions, sugar and anything with can get dissolved in liquids like water, carbon dioxide, Hormones of sex, oxygen etc. Passive Transport and Active Transport are both important and plays a vital role in body like the role of phagocytosis, pinocytosis etc. Mainly in Passive Transport and Active Transport the amino acids, other lipids, complex or simple sugars that requires to enter cell’s body is by Active Transport Pump known as ATP and also termed as protein pump which needs Active Transport but their Diffusion is much slow but maintain the equilibrium. carbon dioxide is a waste and that is also excreted out in Passive Transport because of concentration level and other important nutrients such as oxygen and others depending on their concentration level gets inside of cell’s body.

what is difference between active and passive transport?
passive transport vs active transport

Following are the process of Active Transport and differences of active and Passive Transport because active transport is the opposition from gradient concentration so it is forced to get inside by an energy generated by active transport pump (ATP) but in case of Passive Transport, there is no need for energy. Amino acids, potassium ions, sodium ions, hydrogen ions, chlorine ions gets into plasma membrane by force, where as in passive transport the nutrients gets into our out from cellular body by no use of energy.

active transport procedure
active transport

In Passive Transport the complex sugars gets in the membrane with energy hence only 3 processes are described for it but in active transport, movement of macromolecules to plasma membrane is done by some other processes rather than the processes in Passive Transport.


It is not in Passive Transport but it is one of process in active process, here after some substance is generated by cell, exocytosis takes place by fusion of vesicles into plasma membrane and extraction of whatever to move out from cellular body.


It is like facilitated diffusion in Psassive Transport but it’s the process of active transport where the substance when needed inside of cellular body, it enters the cytoplasm and there are further types of this process described under.


It is in active transport is also referred as cellular eating where macromolecules enters the cellular body while enclosed with phagocytosis vesicle but they use ATP but in Passive Transport there is no need of energy for entering the macromolecules.


It is the process of endocytosis in active transport also referred as cellular drinking where micro molecules enters cellular body after enclosed in pinocytosis vesicles with use of ATP but in Passive Transport, there is no need of energy for getting micro molecules inside of cytoplasm.

Receptor‐mediated endocytosis

here receptors are needs in order to get the macro or micro molecules inside of cytoplasm with use of ATP but in Passive Transport, there are also receptors but there is no use of energy for getting macro and micro molecules inside of cellular body.

Major difference between Passive Transport and Active Transport is that Passive Transport do not acquire energy where as active transport needs energy for functioning.

Processes of Passive transport

Process of Passive Transport is simple that used takes the gradient’s concentration to lower level without using energy and, Passive Transport processes are explained further.

Passive Transport Diffusion Process

Passive Transport Diffusion is the process in which any substance’s movement is transferred to lower concentration from the higher level of concentration. So, the movement is scattered (random) and properties of ions, atoms and molecules (atoms compline form molecule) is not depending to other molecules, atoms or ion’s movement.

how diffusion works?
diffusion process

Passive Transport is a natural process but it does not mean all the molecules moving from higher to lover level but can go against the concentration level depending the nature of molecules but the movement is arbitrary but in Passive Transport, we check net movement in the concentration gradient so we can identify the overall movement and due to gradient’s concentration the ions, proteins, sugars etcetera can be randomly identified.

Osmosis Process in Passive Transport

Passive Transport’s Osmosis process is H2O’s molecules from higher to lower concentration to a semi-permeable membrane, so once H2O gets into cellular body, the pressure is increased.

Dialysis Process in Passive Transport

Dialysis in Passive Transport is the process where solutes from higher level of concentration to lower level of concentration gets into semi-permeable membrane.

Facilitated Diffusion Process in Passive Transport

Facilitated Diffusion in Passive Transport is the process in which solute proteins and enter through a membrane known as plasma membrane and in case of H2O, in Passive Transport’s Facilitated Diffusion Process, it is really easy for H2O molecules to enter into the membrane (plasma membrane). With the help of special protein, it gets even easier for the H2O to speed up getting into plasma membrane.

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