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A lot of proteins are embedded in a cell's plasma membrane. Some of them have a channel-resembling structure which allows specific ions to pass through. Moreover, some other proteins have more complex structures enabling them to bind ions on the one side of the membrane and, through a change of configuration, to release them on the other.
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Membrane junctions that allow nutrients or ions to flow from cell to cell are?
Desmosomes
What is cell membrane permeability?
It is the ability of the membrane to allow ions and/or particles to cross.
Do most animal cell membranes have proteins that pump sodium ions out of the cell and potassium ions into the cell?
Most animal cell membranes have proteins that pump ______ ions out of the cell and potassium ions into the cell
What's the direction sodium ions are pumped?
Sodium ions and potassium ions are pumped in opposite directions. Sodium ions are pumped out of the cell and potassium ions are pumped into the cell.
A salt bridge is needed in an electrochemical cell to buffer provide ions behave as an electrode or complete the electric circuit?
A salt bridge will allow for the completion of a circuit in an electrochemical cell.
In the Na K pump where do the ions go?
Sodium ions go out of the cell and potassium ions go into the cell.
What structural feature of cells can allow molecules to flow directly from the inside of one cell to the inside of the next?
These cells have ionic channels that allow for flow of ions between cells.
What is a passage of material through a cell membrane that does not allow all type of molecules to pass?
The lipid bylayer of the cell membranes is made of phospholipids which are hydrophilic heads and hydrophobic tails. The phospholipids are impermeable to ions such as salts, so the bilayer contains protein channels that allow the cell to regulate which molecules can enter the cell.
What is a brief description of the action of the sodium-potassium pump?
The sodium-potassium pump is a transmembrane protein in a cell membrane. It keeps large concentrations of sodium ions outside the cell, and potassium ions inside the cell. It does this by pumping the sodium ions out, and the potassium ions in.
Do giant covalent structures contain charged ions?
yes
How does the cells charge affect the ions to move into the cell?
The charge of the cell would repel similar charged ions and attract opposite charged ions. For example, if a cell is positively charged, it would repel positive ions and attract negative ions
What structures are formed when water molecules surrounds individual ions?
The phenomenon called ions hydration; it is a hydrated ion.
