Draw a graph of an action potential with the x-axis as time and the y-axis as...
Homework Answers
After stimulus is given, if the membrane potential reaches -55mV , the action potential starts.
At -55mV , there is rapid influx of Na+ into the cell through fast Na+ channels.
During repolarisation, there is efflux of K+ ions through the efflux K+ channels.
These K+ channels are slow. So this leads to hyperpolarisation of membrane. At -90mV , these K+ channels get closed.
Na+ K+ ATPase gets activated and maintains the resting membrane potential (RMP).
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Draw a graph of an action potential with the x-axis as time and the
y-axis as...
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Draw a graph of what happens during the action potentials of an SA node call and the action potentialsbof a cardiac muscle cell. Your x-axis should be time in seconds and your y-axis should be membrane potential in millivolts. Be sure to indicate on the graph which ion channels are open at which times and which ions are moving in which direction. inlcude a paragraph description of the similarities and differences between the two types of action potentials.
Draw an action potential on a graph showing the x-axis and y-axis with proper labels and...
Draw an action potential on a graph showing the x-axis and y-axis with proper labels and numbers (the numbers are approximate as they may vary slightly from neuron to neuron). A. Describe the ionic conductances that underlie the action potential including gating of the specific ion channels at threshold, rising phase, falling phase and the undershoot phase. Explain threshold, absolute refractory period and relative refractory period in relation to the action potential. B. C. Sodium and potassium currents demonstrate very...
Discuss the steps in generating an action potential in a neuron. (Make sure to include which...
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5. Did you notice that during the action potential the neuron membrane potential reaches -90mV and...
5. Did you notice that during the action potential the neuron membrane potential reaches -90mV and stops? How/why does it stop at -90mV? Why doesn't it get more negative than -90mV? Hint: When the voltage-gated K+ channels are open on a neuron, there are so many voltage- gated K+ channels open that in reality you can think of the cell as being only permeable to K+. It's the main ion moving. Based on this and what we talked about on...
The graph illustrates an action potential. Label when sodium and potassium channels are opening and closing....
The graph illustrates an action potential. Label when sodium and potassium channels are opening and closing. Answer Bank potassium channels open sodium channels open sodium channels close Membrane potential (mV) Rest potential potassium channels close Time (ms)
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2. Neuron during an action potential: a. What triggers the first action potential (which ion)? b....
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Compare and contrast graded potentials and action potentials, with particular attention to their locations in the...
Compare and contrast graded potentials and action potentials, with particular attention to their locations in the neuron and the ions and ion channels involved in each. Label a voltage-versus-time diagram of an action potential with the ions involved in each phase, the direction of their movement across the membrane, and the terms depolarize, repolarize, and hyperpolarize. Describe the physiological process involved in the conduction (propagation) 2 of an actic potential, including the types and locations of the ion channels involved....
If necessary, refer to Animation: Chemical Synapses. When an action potential reaches the axon terminal: sodium...
If necessary, refer to Animation: Chemical Synapses. When an action potential reaches the axon terminal: sodium ions are released from the axon terminal, enter the cell body of the postsynaptic neuron through its sodium channels, and may initiate an action potential in that neuron. neurotransmitter molecules are released from the axon terminal and bind to receptors on the postsynaptic neuron, causing either an inhibitory hyperpolarization or an excitatory depolarization. neurotransmitter molecules are released from the axon terminal, bind to and...
Drag the labels to identify the sequence of events that occurs at a synapse. Reset Help The Calci...
Drag the labels to identify the sequence of events that occurs at a synapse. Reset Help The Calcium channels open molecules bind to Vesicles containing and calcium ions enter the molecules diffuse acrossreceptors in the plasma neurotransmitter fuse with membrane of the receiving the plasma membrane of synaptic terminal. the synaptic cleftm neuron, causing ion channels there to open the sending neuron 1 An action potential arrives at the synaptic terminal.
Drag the labels to identify the sequence of events...
Draw an action potential on a graph showing the x-axis and y-axis with proper labels and numbers (the numbers are approximate as they may vary slightly from neuron to neuron). A. Describe the ionic conductances that underlie the action potential including gating of the specific ion channels at threshold, rising phase, falling phase and the undershoot phase. Explain threshold, absolute refractory period and relative refractory period in relation to the action potential. B. C. Sodium and potassium currents demonstrate very...
5. Did you notice that during the action potential the neuron membrane potential reaches -90mV and stops? How/why does it stop at -90mV? Why doesn't it get more negative than -90mV? Hint: When the voltage-gated K+ channels are open on a neuron, there are so many voltage- gated K+ channels open that in reality you can think of the cell as being only permeable to K+. It's the main ion moving. Based on this and what we talked about on...
The graph illustrates an action potential. Label when sodium and potassium channels are opening and closing. Answer Bank potassium channels open sodium channels open sodium channels close Membrane potential (mV) Rest potential potassium channels close Time (ms)
Ldlicu upon 16 What is the difference between a graded potential and an action potential? Where would a praded potential occur in the neuron? An action potential? 16. The most widely used inhibitory neurotransmitter is This neurotransmitter opens up ion channels in the postsynaptic membrane. Ions rush (in/out) and bring the cell (closer to/further from) threshold level. 17. Label the following diagram with these terms: depolarization, repolarization, hyperpolarization, Na gates open, Na' gates closed, K gates open, K' gates closed,...
2. Neuron during an action potential: a. What triggers the first action potential (which ion)? b. What is the typical threshold potential of a neuron? c. The calculated equilibrium potential of Na+ (EN) is approx. +60mV (calculated). Explain how this is related to the rising phase of an action potential (depolarization). d. The calculated equilibrium potential of K+ (EK) is approx. -90mV. Explain how this is related to the falling phase (repolarization). e. Direction of Nation movement (influx/efflux). f. Direction...
Compare and contrast graded potentials and action potentials, with particular attention to their locations in the neuron and the ions and ion channels involved in each. Label a voltage-versus-time diagram of an action potential with the ions involved in each phase, the direction of their movement across the membrane, and the terms depolarize, repolarize, and hyperpolarize. Describe the physiological process involved in the conduction (propagation) 2 of an actic potential, including the types and locations of the ion channels involved....
Drag the labels to identify the sequence of events that occurs at a synapse. Reset Help The Calcium channels open molecules bind to Vesicles containing and calcium ions enter the molecules diffuse acrossreceptors in the plasma neurotransmitter fuse with membrane of the receiving the plasma membrane of synaptic terminal. the synaptic cleftm neuron, causing ion channels there to open the sending neuron 1 An action potential arrives at the synaptic terminal.
Drag the labels to identify the sequence of events...
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