The simplest mechanism by which molecules can cross the plasma membrane is passive diffusion.
During passive diffusion, a molecule simply dissolves in the phospholipid bilayer, diffuses across it, and then dissolves in the aqueous solution at the other side of the membrane..
Diffusion: One of the advantages of diffusion, is that solutes can freely cross the membrane without the need of a transporter or channel.
Another advantage, the cell does not need to use any energy to get the solute across as it will cross down its concentration gradient, from high to low concentration..
You must know that diffusion has three types as they are simple diffusion, osmosis, and facilitated diffusion..
Diffusion is defined as the net movement of molecules from an area of greater concentration to an area of lesser concentration.
The molecules in a gas, a liquid or a solid are in constant motion due to their kinetic energy..
Diffusion is a type of transport that simply occurs when there is a concentration difference where the molecules move from a region of higher concentration to a region of lower concentration.
When particles in liquids and gases randomly collide and disperse, diffusion takes place..
physics. diffusion, process resulting from random motion of molecules by which there is a net flow of matter from a region of high concentration to a region of low concentration.
A familiar example is the perfume of a flower that quickly permeates the still air of a room..
Diffusion is the movement of molecules from an area of high concentration of the molecules to an area with a lower concentration.
The difference in the concentrations of the molecules in the two areas is called the concentration gradient.
Diffusion will continue until this gradient has been eliminated..
Diffusion is the net passive movement of molecules or particles from regions of higher to regions of lower concentration.
For diffusion to occur there must be a concentration gradient..
Diffusion is the process of movement of molecules under a concentration gradient.
It is an important process occurring in all living beings.
Diffusion helps in the movement of substances in and out of the cells..
Diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration down the concentration gradient..
Diffusion is the movement of particles move from an area of high concentration to an area of low concentration until equilibrium is reached.
A distinguishing feature of diffusion is that it results in mixing or mass transport without requiring bulk motion..
Diffusion is the movement of a molecule down a concentration gradient, from an area of its high concentration to an area of its low concentration.
This process is passive, i.e. it requires no input of additional energy; the concentration gradient alone is enough to drive the process..
diffusion, process resulting from random motion of molecules by which there is a net flow of matter from a region of high concentration to a region of low concentration.
A familiar example is the perfume of a flower that quickly permeates the still air of a room..
Diffusion is defined as the net movement of molecules from an area of greater concentration to an area of lesser concentration.
The molecules in a gas, a liquid or a solid are in constant motion due to their kinetic energy.
Molecules are in constant movement and collide with each other..
Diffusion occurs in the alveoli, as oxygen diffuses from a high concentration in the alveoli into the blood across the capillaries and carbon dioxide diffuses from the blood into the alveoli, along the concentration gradient..
Diffusion happens when a substance moves from an area of high concentration to an area of low concentration.
Gases and liquids are often the particles that undergo diffusion because their particles move randomly and quickly..
Simple passive diffusion occurs when small molecules pass through the lipid bilayer of a cell membrane.
Facilitated diffusion depends on carrier proteins imbedded in the membrane to allow specific substances to pass through, that might not be able to diffuse through the cell membrane..
The first systematic studies of diffusion in gases were probably performed by the Scottish chemist Thomas Graham (1805 – 1869).
He is considered as one of the leading chemists of his generation..
Diffusion is the movement of particles move from an area of high concentration to an area of low concentration until equilibrium is reached.
A distinguishing feature of diffusion is that it results in mixing or mass transport without requiring bulk motion..
Diffusion is a physical process that refers to the net movement of molecules from a region of high concentration to one of lower concentration.
The material that diffuses could be a solid, liquid or gas.
Similarly, the medium in which diffusion occurs could also be in one of the three physical states.
One of the main characteristics of diffusion is.
Therefore, no ATP is required for this type of diffusion across the membrane, it is simply a matter of molecules moving down a concentration gradient.
As simple diffusion does not require ATP, large polar molecules or ions cannot diffuse across the membrane.
Diffusion is an important part of many biological and chemical processes.
In biological systems, diffusion occurs at every moment, across membranes in every cell as well as through the body.
For example, oxygen is at a higher concentration inside arteries and arterioles, when compared with the oxygen levels in actively respiring cells.
By the time .
Diffusion is affected by temperature, area of interaction, steepness of the concentration gradient and particle size.
Each of these factors, independently and collectively can alter the rate and extent of diffusion.
Diffusion in the human body is necessary for the absorption of digested nutrients, gas exchange, the propagation of nerve impulses, the movement of hormones and other metabolites towards their target organ and for nearly every event in embryonic development.
Gradually, as more substrate is transferred across the membrane, C 1 decreases as C 2 increases until C 2 = C 1 and at this point delta G =0 and the system is at equilibrium.
Simple diffusion occurs by the diffusion of molecules, such as:
1.
Which of these statements about diffusion of molecules is true.
A.
Facilitated diffusion is powered entirely by GTP hydrolysis B.
Never needs the presence of any other molecule C.
Diffusion of every molecule is dependent on its concentration gradient and independent of the concentration of other molecular species in the medium D.All of the above.
Concentration Gradient– Gradual decrease in the concentration of a substance, often a solute in a solution.
Within living systems, this gradient is usually seen on two sides of a semi-permeable lip.
Diffusion refers to the phenomenon by which concentration and temperature gradients spontaneously disappear with time, and the properties of the system become spatially uniform.
As such, diffusion refers to the transport of mass and energy in a nonequilibrium system that leads toward equilibrium.
Diffusion is affected by temperature, area of interaction, steepness of the concentration gradient and particle size.
Each of these factors, independently and collectively can alter the rate and extent of diffusion.
In any system, molecules are moving with a certain amount of kinetic energy.
