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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 of the cell?
it goes in straight lines
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.
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
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?
A polar substance can cross a cell's plasma membrane through facilitated diffusion, which does not require energy expenditure. In this process, specific transport proteins help the polar substance move down its concentration gradient from an area of higher concentration to an area of lower concentration. This movement occurs until equilibrium is reached.
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.
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 it called when Water passes through the cell membrane from a high concentrated area to a less concentrated area?
Osmosis
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 transports substance in and out of cells?
Proteinscell membrane
If a substance is able to diffuse across a membrane then the membrane is said to be what?
selectively permeable
What is the membrane said to be if a substance is able to diffuse across a membrane?
selectively permeable
What is the substance that fills the cell from the plasma membrane to the nuclear membrane?
The semifluid substance that fills a cell is cytoplasm.
