chapter 7 k+and na pumps and changes in membrane potential - Because 3 Na+ are p
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chapter 7 k+and na pumps and changes in membrane potential
- Because 3 Na+ are pumped out for every 2 Kt taken in, pump is It adds about 3mV to RMP - At rest the membrane is more permeable to K+ therefore a -Na*/K+ pump not only establishes concentration gradients but also maintains them. - Because the Na+/K+ pump is electrogenic is contributes - Because ATP energy is required to sustain the RMP of a neuron, the cell is equiibrium: not considered at Instead it is called 2K* 3 Na -Can trigger the release of neurotransmitters, which carry a signal to another cel occurs when MP becomes more positive MP becomes more negative (inside) than RMP MP returns to RMP - Used to integrate, send, and receive information - Membrane potential changes are produced by: - Changes in membrane to ions Types of signals include: which are small changes in membrane potential that occur when ion channels open/close in response to some stimulus acting on the cell. These types of signals determine if an action potential will occur occur on the membranes of excitable cells in response to graded potentials that reach threshold, and can travel long distances.Explanation / Answer
Na+/K+ - ATPase pump – The sodium potassium pump is an enzyme which is found in the plasma membrane of all the cells of animals. It helps in performing different types of cell physiology. The solute pump helps in pumping out the 3 Na+ for 2 K+ ions which helps in maintaining the charge ratio.
Negative – The rest potential is always negative for the fact that it becomes more permeable to K+. The inside is more negative as compared to the outside during the rest phase.
Contributes to the negativity of the resting membrane potential – This makes the Na+/K+ pump electrogenic as it for 3 Na+ pumped out, it releases 2 molecules of K+. This leads to more negative membrane potential during resting.
Resting membrane potential = It is something that is determined by the concentration of the ions on both the sides of the cell membrane.
Changes in Membrane Potential
Depolarization – This is what happens when the membrane potential become more positive in charge. In this there is a shift in the electronic charge distribution and it leads to less negative charge inside the cell.
Hyperpolarization – it is the change in the membrane potential of the cell which makes it more negative and it inhibits the action potential
Action Potential – It is basically change in the electrical potential as there is the movement of the impulse along the nerve or the muscle cell.
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