被动扩散 - 百度百科
被动扩散（Passive diffusion）是指离子或小分子在浓度差或电位差的驱动下，不需要任何特定的转运介质或载体，而通过膜转运的一种形式。 被动扩散不需要直接的能量输入。
Passive Transport - Definition and Examples - Biology Dictionary
2020年4月25日 · Passive transport, also known as passive diffusion, is a process by which an ion or molecule passes through a cell wall via a concentration gradient, or from an area of high concentration to an area of low concentration.
Passive transport - Wikipedia
Passive diffusion across a cell membrane. Passive transport is a type of membrane transport that does not require energy to move substances across cell membranes. [1] [2] Instead of using cellular energy, like active transport, [3] passive transport relies on the second law of thermodynamics to drive the movement of substances across cell ...
Passive and Facilitated Diffusion - Biology LibreTexts
2023年7月13日 · Explain the concept of concentration gradient and how it drives diffusion. Describe the mechanisms of passive and facilitated diffusion, including their differences and similarities. Understand the role of carrier proteins and channels in facilitated diffusion. Describe the factors that can affect the rate of diffusion across a membrane.
5.6: Passive Transport - Diffusion - Biology LibreTexts
2024年11月23日 · Diffusion is a passive process of transport. A single substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across a space. You are familiar with diffusion of substances through the air. For example, think about someone opening a bottle of ammonia in a room filled with people.
Transport of Small Molecules - The Cell - NCBI Bookshelf
During passive diffusion, a molecule simply dissolves in the phospholipid bilayer, diffuses across it, and then dissolves in the aqueous solution at the other side of the membrane. No membrane proteins are involved and the direction of transport is determined simply by the relative concentrations of the molecule inside and outside of the cell.
17.2: Membrane Transport - Biology LibreTexts
Passive diffusion is the movement of molecules over time by random motion (also called Brownian motion) from regions of higher concentration to regions of lower concentration. Significant passive diffusion across cellular membranes is limited to a few molecules, mostly gasses like O2, CO2, and N2, that can freely cross the hydrophobic ...
Passive Transport: Diffusion – Principles of Biology
In passive transport, substances move from an area of higher concentration to an area of lower concentration in a process called diffusion. A physical space in which there is a different concentration of a single substance is said to have a concentration gradient .
Diffusion: Passive Transport and Facilitated Diffusion - ThoughtCo
2019年8月20日 · Facilitated diffusion is a type of passive transport that allows substances to cross membranes with the assistance of special transport proteins. Some molecules and ions such as glucose, sodium ions, and chloride ions are unable to pass through the phospholipid bilayer of cell membranes .
Passive Transport – Definition, Types, Examples
2024年4月7日 · Passive transport, also known as passive diffusion, is the passage of an ion or molecule through a cell wall along a concentration gradient, or from a region of high concentration to a region of low concentration.