0
The "fast" voltage-gated sodium channels open at -55 mV and close at about +60 mV. I found your question by attempting to find an answer to its second part which is "when [do]...potassium channels open..." and I have yet to find the answer to this myself! There are lots of graphs in physiology books which indicate it is at a voltage very close to that of the sodium channel but I have yet to find an actual figure! The important thing to know is that the potassium channels open at a similar time but are much slower at allowing potassium to flow out of the cell. The effect is that the influx of sodium rapidly brings the resting membrane potential from it's threshold potential of -55 mV to its peak of about +60 mV, at which point they close and become refractory. The slower potassium efflux then "catches up" and brings the membrane potential back down towards its resting value and actually causes a small over-shoot known as hyperpolarisation. The net change in cytosol concentration of the ions is minimal and quickly reversed by the magnificent Sodium-Potassium-ATPase. If you come across the answer to the opening voltage of the potassium channels, please let me know!
What else can I help you with?
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.
What are two ions that are needed for nerve transmission?
Not minerals, it is ions. Calcium ions and sodium ions.
What Active transport will remove ions while taking in potassium ions?
The sodium-potassium pump is a type of active transport that removes sodium ions from the cell while taking in potassium ions. This pump helps to maintain the electrochemical gradient across the cell membrane by actively pumping out three sodium ions for every two potassium ions pumped into the cell.
What type of ions does the sodium-potassium pump pick up on the outside of the cell?
Sodium ions
Which statements are not true about the sodium potassium pump?
The sodium-potassium pump moves sodium ions out of the cell and potassium ions into the cell. The pump functions using energy from ATP hydrolysis. The pump maintains the chemical and electrical gradients of sodium and potassium ions across the cell membrane. The pump is found only in prokaryotic cells and not in eukaryotic cells.
Which ions are exchanged in a sodium potassium pump?
3 sodium ions for 2 potassium ions.
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.
What type of ions does sodium potassium releases inside the cell?
Sodium potassium pumps release sodium ions (Na+) outside the cell and potassium ions (K+) inside the cell through active transport. This process helps maintain the cell's electrolyte balance and membrane potential.
What ions are pumped in and out of cell through the sodium potassium pump?
3 sodium ions go out and 2 potassium ions go in
What protein is sodium potassium?
Sodium-potassium ATPase is a membrane protein that helps maintain the sodium and potassium balance in cells by pumping three sodium ions out of the cell for every two potassium ions pumped in.
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.
What occurs during a single cycle of sodium-potassium exchange pump?
Three sodium ions are moved out of the cell for every ATP hydrolyzed by the pump. At the same time, two potassium ions are moved into the cell.
What are two ions that are needed for nerve transmission?
Not minerals, it is ions. Calcium ions and sodium ions.
What Active transport will remove ions while taking in potassium ions?
The sodium-potassium pump is a type of active transport that removes sodium ions from the cell while taking in potassium ions. This pump helps to maintain the electrochemical gradient across the cell membrane by actively pumping out three sodium ions for every two potassium ions pumped into the cell.
Process by which ATP is used to move sodium ions out of the cell and potassium ions back into the cell?
This process is called the sodium-potassium pump. It uses ATP to pump sodium ions out of the cell against their concentration gradient and pump potassium ions back into the cell against their concentration gradient. This mechanism helps maintain the appropriate balance of sodium and potassium ions inside and outside the cell, which is crucial for cellular functions such as nerve transmission and muscle contraction.
What is most salt of potassium sodium and ammonium ions?
The salt with the most amount of sodium ions is sodium chloride (table salt). The salt with the most amount of potassium ions is potassium chloride. The salt with the most amount of ammonium ions is ammonium nitrate.
How does the potassium ion channel selectively allow potassium ions k plus to pass through but block sodium ions Na Plus?
Potassium ion channels have a selectivity filter with specific amino acid residues that are the right size and shape to accommodate potassium ions, but not sodium ions. This size exclusion mechanism allows potassium ions to pass through while effectively blocking sodium ions. Additionally, the charge properties of the selectivity filter can also contribute to the selectivity of the potassium ion channel for potassium ions over sodium ions.
