Net diffusion will always occur. There must be areas of different concentrat...

Net diffusion will always occur. There must be areas of different concentrations D. Aug 20, 2025 · Shorter distances or thinner barriers facilitate faster diffusion. What factors are required for net movement of a substance to occur by facilitated diffusion? a concentration gradient a plasma membrane a transport protein All of these choices are correct. Study with Quizlet and memorize flashcards containing terms like Which of these statements describes what occurs in facilitated diffusion? -Facilitated diffusion requires energy from the cell to drive a concentration gradient. In the human body, it is essential for gas exchange in the lungs, where oxygen diffuses from the alveoli into the bloodstream due to a higher oxygen concentration in the lungs than in the blood. The rate of diffusion is directly proportional to the difference in concentration and the diffusion constant [latex]D [/latex]. D Why does active transport of molecules across a membrane require ATP? A. c) The neuron is less likely to generate an action potential. Osmosis is a type of diffusion specifically for water molecules moving across a semi-permeable membrane. Physiology Terms Chapter 4 Diffusion Click the card to flip 👆 Movement of molecules from one location to another because of random thermal molecular motion; net diffusion always occurs from a region of higher concentration to a region of lower concentration Click the card to flip 👆 1 / 27 Net Diffusion Net diffusion is when the flow of solute particle moving in one direction is bigger than the flow of solute particles moving in the opposite direction. -Facilitated diffusion of solutes occurs through phospholipid pores in the membrane Diffusion is the net movement of anything (for example, atoms, ions, molecules, energy) generally from a region of higher concentration to a region of lower concentration. -Facilitated diffusion of solutes occurs through protein pores in the membrane. a plasma membrane B. Net Diffusion in Action Net diffusion occurs in both living systems and everyday life. At school you learned that particles move down their gradient of concentration (from a region of high solute concentration to region of low solute concentration) until the same concentration of particles is reached everywhere Summary Diffusion describes the net movement of molecules from an area of high concentration toward areas of lower concentration. Net diffusion always occurs from a region of higher concentration to a region f lower concentration and the distances covered are very small. Study with Quizlet and memorize flashcards containing terms like What is the solvent in biological solutions such as cytoplasm and blood?, A concentration gradient exists in a solution when, In which types of medium does molecular movement occur? and more. a concentration gradient C. Jan 26, 2025 · Diffusion, a cornerstone principle in biological systems, describes the net movement of molecules or ions from a region of higher concentration to a region of lower concentration. The net diffusion rate is proportional to the concentration gradient. Therefore, for osmosis to occur, the membrane must be permeable to water, but Study with Quizlet and memorize flashcards containing terms like The idea that all living things are composed of cells come from other cells defines what?, To enter or leave a cell, substances must pass through, The movement of molecules from an area of higher concentration to lower concentration is called what? and more. What happens when a resting neuron's membrane depolarizes? a) The neuron's membrane voltage becomes more positive. e) The equilibrium potential for K+ (EK) becomes more positive. The greater the concentration gradient, the faster the rate of diffusion that will occur. Fick's first law can be used to derive his second law, which in turn is identical to the diffusion equation. A concentration gradient is the difference in concentration of a substance between two areas, which drives diffusion or osmosis. cur uvv ziez nne nmvk vgmzgy sexml opg diwqxp xlybvb