Energy is required to do work. What type of work is being done by the Na+/K+ ATPase that allows it to maintain a steady state in the neuron? 1. both chemical and transport work 2. Mechanical work 3.chemcial work 4.transport work
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Energy is required to do work. What type of work is being done by the Na+/K+ ATPase that allows it to maintain a steady state in the neuron?
1. both chemical and transport work
2. Mechanical work
3.chemcial work
4.transport work
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- Graph of membrane potential versus time The graph above represent time in milliseconds. At what time (in milliseconds) is the inside of the neuron the most positive and why? Explain why the membrane potential changes at X. Explain what is happening at point C to the sodium and potassium ions and how this is affecting the membrane potential. Describe two things that contribute to the resting membrane potential.Describe in detail how movement of ions causes a neuron to fire . Make sure to include how membrane potential is changed and which specific ions are moving in what directions to cause the firing .Please ASAP. Thanks Ion Extracellular Concentration (mM) Intracellular Concentration (mM) Na+ 440 50 K+ 20 400 Cl- 560 52 Ca++ 10 1 What is the effect of the addition of extracellular TTX and TEA on equilibrium potential? TTX blocks K channel, and TEA blocks Na Channels. No change in the equilibrium potentail. TTX blocks Na channel and TEA blocks K Channels. The equilibrium potentials become less positive TTX blocks Na channel and TEA blocks K Channels. The equilibrium potential becomes more positive for both TTX blocks Na channel and TEA blocks K Channels. No change in the equilibrium potentail. TTX and TEA blocks Na channel. No change in the equilibrium potentail.
- Fill in the blank :- The depolarization phase of action poten:-tials in neurons is due primarily to......... (ion) flow into the cellNeurons communicate with one another via action potentials and neurotransmitter release. This activity critically depends on maintaining electrochemical gradients across neuronal membranes. What would be the likely outcome of increased neuronal activity on ATP usage? a. No effect on ATP usage b. More ATP will be used c. Less ATP will be usedDepolarisation & repolarisation in metaneuron - put the following events in order (from 1 to 4). Membrane potential crosses the threshold potential and an action potential is achieved. Depolarisation occurs when the applied current is sufficient to move membrane potential towards neutral. The neuron’s membrane potential drops below the initial resting membrane potential and temporarily becomes refractory to further action potentials. Membrane quickly repolarises by opening of K+ channels, allowing K+ions to leave the cell and charge separation to be re-established.
- Watch this video (http://openstaxcollege.org/l/summation) to learn about summation. The process of converting electrical signals to chemical signals and back requires subtle changes that can result in transient increases or decreases in membrane voltage. To cause a lasting change in the target cell, multiple signals are usually added together, or summated. Does spatial summation have to happen all at once, or can the separate signals arrive on the postsynaptic neuron at slightly different times? Explain your answer.Fill in the blank The all-or-none principle, associated with the action potential, states that once membrane potential reaches......... magnitude an action potential will be generated and will be the sameVirtually all vertebrate cells, whether excitable or not, have a resting membrane potential (RMP). please choose the right answer fro C1 C2 C3 and C4 C. Suppose you add enough KCl to increase the [K+] in the ECF from the usual value (3 mM) to 4.5 mM. What should happen to a neuron? C-1. You expect the RMP to become (+ or more +) (- or more -) (less -) (less +) (go to, or stay at, zero) (stay at the normal nonzero value). C-2. You expect the total number of K+ ions inside the cell to (increase) (decrease) (stay about the same). C-3. You expect the net [K+] inside the cell -- in mM -- to (increase significantly) (decrease significantly) (stay about the same). C-4. Suppose the neuron under consideration gets input from many different synapses. You increase the [K+] in the ECF as above. Given your answer to part C-1, the neuron should be (more likely) (less likely) (about equally likely) to fire an action potential. No explanation required on the exam, but it helps to see how you…
- Compare graded and action potentials in a typical neuron. At a minimum you should include a description of membrane potential and how it is generated, the specific ion channels and how they are involved in generating a graded or action potential, how the strength of stimulus effects the strength of the response.Astrocytes use _______ ______ to convert glutamate and NH4 into _______ for neuron re-uptake. mitochondria, ATP glutamine synthase, glutamine action potentials, voltage glycine, glucoseHow do you think AMPK (AMP-activated protein kinase) helps the athletes on achieving the "unexpected sudden strength" during high intensity activities? Make your answer brief and concise.