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Some ions are prevented from moving down their concentration gradients by ATP-driven pumps. Some ions move from high to low concentration gradients through membrane protein channels, and some ion gates in the membrane can open in response to electrical potential changes.
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How does the movement of materials across the cell membrane relate to an organism's survival-?
It can allow nutrients to enter a cell without compromising the integrity of the cell. Semipermeable membranes abound in nature.
Which molecules help control movement of substances through cell membranes?
proteins help control movement of substances through cell membranes.
Why do cell membranes have convolutions?
To increase surface area, allowing greater contact area for 'transport' of nutrients (movement of substances across the membrane).
What is required to transport glucose molecules across the cell membranes of the intestine?
To start the process ATP is required to transport glucose milecules across the cell membranes of the intestine.
How does facilitated diffusion work?
It is a passive process utilizing a protein carrier or channel.
What do you call the movement of water across cell membranes?
osmosis
What mechanism fails in Cystic Fibrosis patients?
The movement of chloride ions across the cell membranes.
What is facillitated diffusion?
Facilitated diffusion is, the movement of specific molecules across cell membranes through protein channels
What has the author Wilfred Donald Stein written?
Wilfred Donald Stein has written: 'The movement of molecules across cell membranes'
How does the movement of materials across the cell membrane relate to an organism's survival-?
It can allow nutrients to enter a cell without compromising the integrity of the cell. Semipermeable membranes abound in nature.
Which molecules help control movement of substances through cell membranes?
proteins help control movement of substances through cell membranes.
Why do cell membranes have convolutions?
To increase surface area, allowing greater contact area for 'transport' of nutrients (movement of substances across the membrane).
What is required to transport glucose molecules across the cell membranes of the intestine?
To start the process ATP is required to transport glucose milecules across the cell membranes of the intestine.
How does facilitated diffusion work?
It is a passive process utilizing a protein carrier or channel.
How do unicellular get water?
Water diffuses across their cell membranes
What is a Diffusion is the movement of a substance?
diffusion is the movement of materials into cell membranes when the outside of the cell has a higher density than the inside
What would happen to a cell if materials could not move across the cell membranes?
it will died
