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Which statement displays the address of the variable num1? The SER detoxifies drugs and harmful substances ingested by and produced in the body. 1. Which one of the following processes can explain this? A primary active transport process is one in which __________. ADP is released as a by-product. One of the main characteristics of . Typically, diffusion refers to the movement of molecules from high concentrations to lower concentrations. When placed in a hypertonic solution, a red blood cell will lose water and undergo crenation (shrivel). Which of the following best explains the reasons for the similarities and differences between the two land survey systems shown? The cell membrane allows the cell to stay structurally intact in its water-based environment. Unit 3 Culture Test | Geography Quiz - Quizizz Simple diffusion is merely the movement of molecules along their concentration gradient without the direct involvement of any other molecules. Why can't the Sodium move down it's concentration gradient by using the same channel the Potassium uses? if there are more Potassium ions in a cell, how is the cell negatively charged? When these molecules collide with one another, there is a change in the direction of movement as well as changes to momentum and velocity. The end result is an equal concentration, or equilibrium, of molecules on both sides of the membrane. In the case of a cell, positive and negative charges are separated by the barrier of the cell membrane, with the inside of the cell having extra negative charges relative to the outside. All the examples given above were instances of simple diffusion. molecules move through transport proteins that have been activated by ATP. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. thank you. Diffusion happens slowly and only across the small surface of interaction between the two fluids. The second sugar solution is hypertonic to the first. Epinephrine diffuses through the plasma membrane; the hormone dimerizes in the cytosol. Imagine this just like a hydroelectric power station uses the energy of water flowing down the waterfall to create electricity. Mr. Weddington was admitted to the hospital with chronic heart failure. Which of the following best explains diffusion? As an example, let's suppose we have a high concentration of sodium ions in the extracellular space (thanks to the hard work of the sodium-potassium pump). Diffusion will continue until the concentration gradient has been eliminated. This is usually not directed in any particular manner, and can appear random. At that concentration, the solution is isotonic to the cell. Biology Dictionary. The rate of diffusion of a gas across a surface is controlled by the following: k, the gas diffusion constant; A, the area for gas exchange; P2-P1, the difference in partial pressure of gas on either side of diffusion barrier; D, the distance across which the gas must diffuse (thickness of diffusion barrier) By diffusion: glucose will move from solution B to solution A. Active transport mechanisms can be divided into two categories. For instance, in the example about the diffusion of iodine gas, if the crucible is placed in another closed container and iodine crystals are heated for an extended period of time, the rate at which the purple gas seems to disappear at the mouth of the crucible will reduce. A. Direct link to Ivana - Science trainee's post yes, dimensions also play. In an isotonic solution, the flow of water in and out of the cell is happening at the same rate. Figure showing the transport cycle of the sodium-potassium pump. Incorrect options: Option A is incorrect because space-time compression is the shortened time or communication between two places.