passive transport
Passive transport does not use energy to pass through a cell membrane. active transport uses energy to pass through a cell membrane.
A freely permeable membrane allows all molecules or ions to pass through it without any hindrance. This means that there are no restrictions on the movement of substances across the membrane, and it is completely permeable to all solutes.
The movement of material through a membrane can occur via passive processes such as diffusion and osmosis, where substances move down their concentration gradient without requiring energy input. Active transport, on the other hand, involves the use of energy to move substances against their concentration gradient. Facilitated diffusion involves the use of carrier proteins to help transport specific molecules across the membrane.
Passive transport is the movement of substances across a cell membrane without the use of energy. This process includes simple diffusion, facilitated diffusion, and osmosis. These mechanisms rely on the concentration gradient to drive the movement of molecules.
Passive transport using osmosis and diffusion. Osmosis only applies to the movement of water down a concentration gradient across a selectively permeable membrane. DOH!!!
Apoplastic flow is the movement of water and solutes through the cell walls and intercellular spaces of plant tissues. This pathway allows for the transport of substances without crossing a plasma membrane.
"diffusion"
Substances that can freely dissolve through the plasma membrane are generally small and nonpolar molecules, such as oxygen, carbon dioxide, and ethanol. These molecules are able to pass through the lipid bilayer of the plasma membrane without requiring a specific transport protein.
A selectively permeable membrane allows water molecules to pass through but restricts the movement of larger solute particles like NaCl. In osmosis, water will move from a dilute solution to a concentrated solution through the membrane, causing a net movement of water without the movement of NaCl.
Lipids and oils are able to move through the plasma cell membrane via simple diffusion. The lipid bilayer structure of the membrane allows for the passive and selective movement of non-polar molecules, such as lipids and oils, without the need for energy input.
It's called active transport. When talking about the cell, it is usually bigger substances that use passages in the cell membrane to access the inner part of the cell, and they need energy to get there. The opposite; passive transport or diffusion, is the movement of dissolved materials through a cell membrane without the use of cellular energy. THis happens with smaller substances.
Passive transport is when substances move past the membrane without using any energy.