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Diffusion is defined as the movement of molecules from an area of high concentration to an area of low concentration. The diffusion of water molecules through a semi-permeable(selectively permeable) membrane is osmosis. Semi-permeable means that some molecules can move through the membrane while others can not. Diffusion and Osmosis are passive forms of transport requiring no energy. Active Transport utilizes energy in the form of ATP. Water is a solvent that can dissolve a number of substances more than any other substance. Wherever water goes, through the ground or a body, it takes along valuable molecules. Water’s chemical composition causes it to be attracted to many different molecules and be attracted so strongly it disrupts the forces and dissolves it. Water can pass through the semipermeable membrane without any help but can change the solution, on the other side of the cell membrane, depending on how much it diffuses in and out.

Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. Osmosis is a special kind of diffusion that describes the movement of water molecules seperated by a selectively permeable membrane. Cells, which

Diffusion is the movement of molecules from an area of high concentration to an area of low concentration until equilibrium is reached. Osmosis, however, is the movement of water according to its own concentration gradient across a selectively

They have a single closed circulatory system consisting of a heart with a sinus venosus, atrium, and ventricle. Parallel blood capillaries called rete mirabile carry blood to the gas gland and allow it to diffuse to the swim bladder.

During the action of diffusion, particles maneuver from an area of high concentration to a lower concentration area.

When discussing and interpreting diffusion, it is essential to understand the importance of kinetic energy and how it is often times associated with the process of diffusion within the human body. One of the key principles of kinetic energy involve random molecular motion. This kinetic principle, random molecular motion, is one of the direct results of the process called diffusion. Diffusion is best described as “the net movement of a substance (liquid or gas) from an area of higher concentration to one of lower concentration” (Hill 2007). The combination of these substances often times eventually create a single homogenous mixture.

Diffusion is the movement of molecules from an area of high concentration to an area of low concentration or along a concentration gradient which is essentially the same. This continues until the molecule has reached equilibrium and distribution is equal, yet the molecules are still moving. For example, when a dye crystal is placed in water, it is condensed into one area. As it dissolves the molecules moved from a higher concentration to a lower concentration and eventually the dye molecules are equally distributed throughout the water in the container. In this case, the dye molecule is the solute or the thing that is being dissolved and the solvent is what is able to dissolve something and in this example it would be the water.

Diffusion is categorized as passive transport in which atoms or molecules are moved, often through a cell membrane, from a higher to a lower concentration. This process involves the spreading of the solute, which ultimately results in the removal of a concentration gradient (Kate T. et al. 2015). Typically, there are two types of diffusion across a cell membrane: simple or channel-mediated. Simple diffusion occurs when molecules diffuse easily through the membrane; whereas channel-mediated diffusion occurs when molecules pass through the membrane via protein channels—often due to their size or electrical force. There are several factors which can affect the rate and capability of diffusion such as molecule and gradient size, temperature and electrical forces. For example, more extreme temperatures result in a slower rate of diffusion. Thus diffusion at room temperature occurs at a much more rapid rate than would diffusion at an extremely low temperature. Typically, the higher the temperature, the more rapid the rate of

Passive transport is the movement of particles from a high to low concentration. This goes against the concentration gradient. Passive transport requires no energy. There are 2 types of passive transport, diffusion and osmosis. Diffusion is the movement of molecules from a high to low concentration. Factors that can affect diffusion are temperature, pressure, and concentration of molecules. A type of diffusion is facilitated diffusion. This is when the plasma membrane uses proteins to assist larger molecules that will not fit through the membrane on its own (Scogna, 2014).

2.1. Diffusion is the spontaneous kinetic movement by which molecules move from an area of a high concentration to an area of low concentration. Diffusion continues until it reaches equilibrium. Osmosis is similar to Diffusion but it’s the process in which water moves across a semi-permeable membrane and goes to the higher concentration of solute.1

For anatomy and physiology we were learning about human and plant cells. With this lesson we concentrated on the concepts of diffusion and osmosis. Diffusion is the movement of molecules in general from an area of high concentration to low concentration. An example of diffusion is when you spray air freshener. Slowly the smell will spread from one side of a room to another where it is not present, this is diffusion.

All molecules are constantly in motion and have kinetic energy. When these molecules are clustered together and have a high concentration in one area, they tend to collide frequently and spread out. Even though individual molecules may be moving in all directions, the net movement of molecules will go from areas of high concentration to areas of low concentration. This spreading out of molecules is called diffusion. Once the molecules have spread out and reached equal concentration in all areas of the system, there is a dynamic equilibrium where the molecules continue to move but there is no net movement. Diffusion also occurs because it increases entropy in the system; when the molecules spread out, they become more disordered, adhering to the 2nd Law of Thermodynamics (entropy increases for all spontaneous processes).

Passive diffusion, also known as simple diffusion, is used to describe the exergonic reaction of a substance where the substance passes in the direction of the concentration gradient. Most of the molecules move from the area of high concentration, inside the membrane of a cell, to the outside where there is

Multicellular organisms need transport system, transport systems are systems that carry everything around the body. Multicellular organisms need transport system, transport systems are systems that carry everything around the body. A single celled organism is an organism with only one cell whereas a multi-celled organism is an organism with more than one cell for example a single celled organism is bacteria and a multi-celled organism is humans and animals. The surface area to volume ratio of a single celled organism is larger than the surface area to volume ratio of a multi-celled organism. Small organisms don't need transport systems instead all substances are obtained by diffusion. As the organism is small diffusion is able to happen faster. However, large organisms do need transport systems, preferably circulation systems. They cannot rely on diffusion. For small organisms, the distance from the edge to the centre is < 0.5mm whereas for large organism, the distance from the surface to the centre is too big. Also for large organisms, diffusion depends on the volume and surface area, so as this organism has a large surface area to volume ratio, diffusion may be able to happen and if it does it happens faster. If the surface area to volume ratio is small then a circulatory system is needed. Examples of single-celled organism that use diffusion are bacteria whereas for multi-celled organism that use diffusion are jelly fish. Examples of multi-cellular

A unicellular organism is a single celled organism (one cell), which is to rely on the process of diffusion, when moving different substances in and out of other cells, due to its structure it has a larger surface area in comparison to its volume; this is because each organism is built for a specific function. However, they transport materials such as oxygen and urea in and out of bodies, through diffusion and osmosis.