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How does a polar substance get across a cells plasma membrane without the expenditure of energy assuming it is more concentrated outside if the cell?
Wiki User
∙ 14y ago
Facilitated diffusion
Wiki User
∙ 14y ago
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How does the Concentration gradient of a substance affect the movement of that substance and the expenditure of energy?
The larger the concentration gradient (bigger difference between the two solutes across semipermeable membrane) the faster the rate of diffusion.
The part of a foreign substance that is inserted into a macrophage membrane?
The part of a foreign substance that is insertde into a macrophage membrane?
If a substance is able to diffuse across a membrane then the membrane is said to be what?
selectively permeable
How does active transport differ from the process of diffusion across a membrane?
Diffusion is the process in which a certain substance achieves equal concentrations in a specific area. Diffusion across a membrane means that the substance is equally distributed between both sides of the membrane, assuming the substance can pass through that membrane (the membrane is permeable to the substance).Active transport is just that, active. It requires energy because it is usually moving substances to a place where they would not naturally move or increases the rate of their disbursing. Active transport can move molecules against a concentration gradient, whereas diffusion cannot.Simply, active transport means that energy is needed to transport the object/molecule while diffusion is a naturally occurring process dependent on the concentration gradients between the membrane.
If a substance is unable to diffuse across a membrane we say the membrane is?
osmotically active
How does a polar substance get across a cells plasma membrane without the expenditure of energy assuming it is more concentrated outside of the cell?
it goes in straight lines
Given that a nonpolar substance is more concentrated outside of a cell how does it get across a cell's plasma membrane without the expenditure of energy?
Osmosis and diffusion.
How does a polar substance get across a cells plasma membrane without the expendture of energy assuming it is more concentrated outside the cell?
Facilitated diffusion
A substance that moves across a cell membrane without using the cell's energy tends to move?
from an area of low concentration to an area of high concentration (if it is water) the opposite if it is a solid
What is passive membran transport?
The diffusion of substances across a membrane is called passive transport. Molecules move from where the substance is more concentrated to where it is less concentrated.
How does the Concentration gradient of a substance affect the movement of that substance and the expenditure of energy?
The larger the concentration gradient (bigger difference between the two solutes across semipermeable membrane) the faster the rate of diffusion.
What is a substance that moves across a cell membrane without using the cells energy tends to move?
away from the area where it is more concentrated
The part of a foreign substance that is inserted into a macrophage membrane?
The part of a foreign substance that is insertde into a macrophage membrane?
What is it called when Water passes through the cell membrane from a high concentrated area to a less concentrated area?
Osmosis
When a substance moves across the plasma membrane along a concentration gradient at a rate faster than would be expected by simple diffusion alone but without the expenditure of metabolic energy?
It is called facilitated diffusion. It is a type of passive transport.
Is diffusion of water is called osmosis?
Yes, osmosis is defined as the net movement of water molecules from an area where they are highly concentrated to an area where they are less concentrated across a semi-permeable membrane such as a cell surface membrane.
What transports substance in and out of cells?
Proteinscell membrane
