The key difference between active transport and facilitated diffusion is that the active transport occurs against the concentration gradient hence, utilizes energy to transport molecules across the membrane while the facilitated diffusion occurs along the concentration gradient hence, does not utilize energy to transport molecules across the membrane. Show Molecules go in and out the cells using different transport mechanisms. Since the cells have a selectively permeable cell membrane, only some molecules or only selected molecules can go inside the cell and come out of the cell. Osmosis is the main mode of facilitating these movements in cells. Furthermore, there are two other mechanisms namely active transport and facilitated diffusion that helps molecules to move across the cell membrane. As the names suggest, active transport is an active process that utilizes ATP (energy) while the facilitated diffusion is a passive process that does not utilize ATP. That is because the active transport occurs against the concentration gradient while the facilitated diffusion occurs along the concentration gradient. However, both mechanisms take place via channel or carrier proteins located in the plasma membrane. CONTENTS1. Overview and Key Difference What is Active Transport?Active transport is a mechanism of transporting molecules across the cell membrane by utilizing the energy produced through respiration. And, this process occurs against the concentration gradient; from a lower concentration region to a higher concentration region. Hence, unlike passive diffusion, this process demands energy. Also, either carrier proteins or channel proteins facilitate the active transport process. Furthermore, until the energy supply is available, active transport continues, and it will lead to the accumulation of necessary nutrients such as ions, glucose and amino acids inside the cell.  Figure 01: Active Transport Besides, there are two forms of active transport; namely, they are the primary active transport and secondary active transport. The difference between primary and secondary active transport is that primary active transport utilizes ATP to uptake nutrients while secondary active transport utilizes the electrochemical gradient to uptake nutrients. Accordingly, sodium-potassium pump is a protein that involves with the primary active transport while sodium/glucose symporter is a protein that involves with secondary active transport. The uptake of glucose in the intestines of humans is an example of active transport. Another example is the uptake of mineral ions into the root hair cells of plants. What is Facilitated Diffusion?Facilitated diffusion or passive diffusion is the process that facilitates the uptake of nutrients across the cell membrane without utilizing energy. It uses trans-membrane proteins to transport nutrients into the cell. Since it involves integral proteins that are either carrier or channel protein, it differs from the simple diffusion process. Figure 02: Facilitated Diffusion Moreover, it occurs from a higher concentration region to lower concentration region along the concentration gradient. Hence, it does not require energy supply. However, unlike active transport, it does not proceed continuously. It stops at the point where the equilibrium is achieved. What are the Similarities Between Active Transport and Facilitated Diffusion?
What is the Difference Between Active Transport and Facilitated Diffusion?Active transport is the process of moving molecules across the cellular membrane through the use of cellular energy. On the other hand, facilitated diffusion is the process of moving molecules across the membrane without the use of cellular energy. Therefore, this is the key difference between active transport and facilitated diffusion. Basically, active transport occurs against the concentration gradient while facilitated diffusion occurs along the concentration gradient. Thus, this is another difference between active transport and facilitated diffusion. Furthermore, both processes help cells to uptake nutrients. But, active transport causes the accumulation of necessary nutrients inside the cells while the facilitated diffusion does not cause the accumulation of nutrients. Instead, it stops when the concentrations are equal on both sides. Therefore, this is another difference between active transport and facilitated diffusion. The below infographic presents the difference between active transport and facilitated diffusion as a side by side comparison. In summarizig the difference between active transport and facilitated diffusion; the facilitated diffusion is the process of transporting substances across the cell membrane with the help of carrier or channel proteins. It does not utilize cellular energy. On the other hand, another mechanism called active transport utilizes the cellular energy in order to transport nutrients, especially ions across the membrane. Hence, this is the key difference between active transport and facilitated diffusion. Reference:1.“Active Transport.” Khan Academy, Khan Academy. Available here Image Courtesy:1.”0308 Sodium Potassium Pump”By OpenStax (CC BY 4.0) via Commons Wikimedia March 9, 2012
Facilitated diffusion and active transport are two ways of moving materials across the cell membrane. These two types of transport have many similarities as well as differences. One similarity is in what is transported. In facilitated diffusion, ions, sugars, and salts are transported across the membrane. In active transport, ions, sugars, and salts are also transported. The second similarity is that both facilitated diffusion and active transport use proteins as their means of transporting their materials to and from the cell. The integral proteins of the cell change shape to transport the particular substance in or out of the cell. The last similarity is the basic goal of both facilitated diffusion and active transport. The main goal is to move substance across the cell membrane. There is one main difference between facilitated diffusion and active transport. This differences leads to other aspects of these two types of transport to be different as well. This difference is that active transport needs energy, while facilitated diffusion does not need energy. The energy that active transport uses is ATP (adenosine triphosphate). When the protein changes shape in facilitated diffusion, it is because the substances bond onto the protein and the protein, because of this bond, changes it shape. This happens because the substances are going with the concentration gradient. Facilitated diffusion is needed because the substances it transports are too big to pass through the cell membrane. They want to go with the concentration gradient, but just can’t without integral proteins. With active transport, the protein changes shape by using ATP. Energy is needed in this form of transport because the substances are going against the concentration gradient. A great is example is the sodium-potassium pump (Na/K pump). This allows sodium and potassium to move against the concentration gradient. Sodium and potassium can easily diffuse through the cell membrane, but that is only when they are going with the concentration gradient. With the Na/K pump, the cell takes in however many potassium molecules it needs and throws out however many sodium molecules it doesn’t need, even if there is not an equal amount of either substance in and out of the cell. The last difference is that facilitated diffusion allows substances to follow the concentration gradient either way, while active transport only has substances go one way, against their concentration gradient. Facilitated diffusion and active transport are two ways of doing the same thing. Although they have different ways of carrying out their task, they are both efficient ways of moving materials across the cell membrane. |
What are the similarities between facilitated diffusion and active transport What are the differences?
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