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What type of transport is faciliated diffusion?
Neither of these require energy. Diffusion occurs naturally when a higher concentration of a substance exists on one side of a membrane than the other; molecules will enter into the area of lesser concentration until there is an equilibrium on both sides. Active transport requires the energy of the cell.
What is the a major difference between facilitated diffusion and active transport?
Simple diffusion moves molecules from an area of higher concentration to an area of lower concentration without an input of energy. Facilitated diffusion follows the same rules as regular diffusion (higher to lower concentration and no energy input), but uses protein carrier molecules to allow substances that are fat soluble to diffuse through the cell membrane.
Why does oxygen diffuse in and carbon dioxide diffuse out?
In the alveoli, oxygen diffuses into the blood that the capillaries carry due to a concentration gradient that exists there as oxygen conc is higher in the alveolar sacs than in the blood capillaries. Similarly carbon dioxide diffuses out of the blood capillaries into the alveolar sacs down the concentration gradient. The constant flow of blood is there to ensure this concentration gradient is established at all times.
What are two important passive processes for membrane transport?
Diffusion is a method of natural movement of gas molecules from a region of higher concentration to a region of lower concentration. The difference in concentration is called a concentration gradient.Osmosis is the diffusion of water through a biological membrane. Water molecules move along the concentration gradient from the area of higher water concentration to lower concentration.Facilitated diffusion is when proteins within the cell carry or escort certain materials or substances in or out of the cell.
What is a solute pump?
Under normal circumstances, chemical concentrations in any given solution tend to even themselves out, by diffusion, and by the normal process of entropy. Cells often need to have a higher concentration, or a lower concentration of some chemical (which is a solute, because it is dissolved in water) than the concentration that exists outside the cell in the intercellular fluid, the lymph, the blood, or the cerebro-spinal fluid, as the case may be. In order to obtain that difference in concentration it is necessary to have some mechanism in the cell membrane that will actually pump the chemical in question, either out of the cell or into the cell, depending upon whether it is a higher concentration or a lower concentration that is needed. So, there are protein structures that can do this. Those are the solute pumps.
What condition exists when you have a high concentration of molecules in one place and a low concentraition of molecules in an adjacent place?
weather
What condition exists when you have a high concentration of molecules in one place and a low concentration of moleculse on an adjacent place?
Diffusion gradient
What exists when no net change in concentration results from diffusion?
When no net change in concentration results from diffusion, the system has reached equilibrium. At equilibrium, the rate of molecules moving from one area to another is equal in both directions, resulting in a stable concentration gradient.
Why is there a diffusion gradient in the tissues?
A diffusion gradient exists in tissues due to differences in concentration of substances. This gradient drives the passive movement of molecules from areas of higher concentration to areas of lower concentration, allowing cells to obtain necessary nutrients and get rid of waste products.
What exists when molecules are diffusing randomly but equally in all directions?
A state of equilibriumThe net diffusion of molecules requires that there be a difference in concentration, called a concentration gradient, between two points. Once the concentration of molecules is the same throughout the solution.Johnson, Michael D. "3 Structures and Function of Cells." Human Biology: Concepts and Current Issues. San Francisco: Pearson Benjamin Cummings, 2008. 57. Print.
What element exists as molecules containing eight atoms?
Elements normally do not form "molecules" apart from 3 gaseous elements which form diatomic molecules. However, Sulfur exists in molecules comprising 8 atoms, while Phosphorous exists as a 4 atom molecule.
What element exists as x4 molecules?
Carbon dioxide (CO2) exists as X4 molecules, where X represents the element carbon.
What is a variable that signals when a condition exists?
A Boolean variable can be used to signal when a condition exists. It can have a value of true or false based on whether the condition is met or not.
Which group 15 element exists as diatomic molecules?
Nitrogen (N2) is the group 15 element that exists as diatomic molecules.
Which atoms exist as triatomic molecules?
Ozone exists as triatomic molecules. O3
What exists in all polar molecules?
A hydrogen bond
Amino acids tend to diffuse from a blood capillary to the adjacent cell because?
Amino acids tend to diffuse from a blood capillary to the adjacent cell because of the concentration gradient that exists between the two compartments. This process is facilitated by specific transport proteins on the cell membrane that allow the amino acids to move across the membrane. Additionally, the polarity and charge of amino acids play a role in their movement across the cell membrane. Overall, the diffusion of amino acids is a crucial mechanism for nutrient uptake and cellular function.
