Excericse affects your heart rate. Then describe how the action potential graph would change due to this situation( excercise ) . Discuss repolarization / hyperpolarization, and the time between action potential peaks.
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Excericse affects your heart rate.
Then describe how the action potential graph would change due to this situation( excercise ) . Discuss repolarization / hyperpolarization, and the time between action potential peaks.
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- Describe what would happen to the action potential if we blocked the Calcium channels in caridac myocytes, and the effect it would have on the heart.Draw and discuss an AP (action potential). Below this graph draw and discuss the conductance of the important ions moving across this membrane that makes the action potential work. a. Cardiac fiber (non automatic cells) b. SA (self excitable cells)Discuss what happens to the action potential shape when the neuronal environment has sodium removed. What happens if it is then replace?
- Explain the time course of the opening and closing of v-g Na+ and K+ channels during the action potential. How does that affect the ionic currents? COMMENTS : answer this question to best of your knowledge to understand the concept wellBased upon the changes in permeability seen in the trace below and your knowledge of ion distributions across a cell, predict how ion movements would change during an action potential. Drag and drop each phrase into the appropriate box on the action potential trace. Drag the appropriate labels to their respective targets. Note: not all labels will be used. ►View Available Hint(s) Sodium (Na+) ions move to the axon Sodium (Na) ions move out of the axon Less potassium (K) ions move out of the axon Potassium (K) ions move out of the axon Potassium (K¹) ions move into the axon Sodium (Na) ions stop moving in Membrane potential (mv) +30 +10 0 -10- -30 -50 -70 -90 A PNa 0 PNa 5 6 1 PK Threshold PK 2 Reset HelpMatch the stages of action potential with the appropriate image or description. 1. Resting membrane potential 2. Threshold 3. Depolarization 4. Repolarization 5. Hyperpolarization 6. Refractory period The potential difference that must be met in order for an action potential to be generated When the potential drops below resting level When the potential starts to decrease again after it has reached a maximum Occurs at -77 mV When the membrane is resetting and an action potential cannot yet be produced again When the sodium channels are open Occurs at -55 mV
- The next patient seen by the same doctor was suffering from hyperkalemia and was experiencing cardiac arrhythmias. Which of the following reason/s explain/s why this patient was experiencing cardiac arrhythmias? O hyperkalemia leads to an increase in action potential generation because potassium ions in the ECF makes the resting membrane potential more negative O hyperkalemia leads to a decrease in action potential generation because the potassium ion level in the ICF will cause hyperpolarization O hyperkalemia leads to an increase in action potential generation because the high level of potassium ions in the ICF will make achieving threshold easier O a and bDescribe the events that occur during action potential ANSWER SHOULD INCLUDE: Explanation of how resting membrane potential works and which ions inside/outside Expiation of how depolarisation membrane occurs and which ions move in/how they move in . Explanation of "threshold" . Explanation of depolarisation and which ions move out and how they move out. Explanation of hyperpoarisation and how it is corrected. ( state membrane potential in mv during each stage )E. ACTION POTENTIAL Describe what happens in each phases of action potential and explain the following events in the illustration below. 3. Peak action potential +30 Repolarization Threshold of excitation -55 2 1 Hyperpolarization -70 Resting potential 4 Time [Enter description here] Membrane potential (mV)
- A True OUTSIDE CELL This cell is at rest. False INSIDE CELL C D T EDraw and label an action potential, indicating the ion movements responsible for the rising phase and the falling phase.Answer the following questions regarding conduction of action potentials using the velocities given on p. 100: a. How long would it take for an action potential to travel 0.6 m along the axon of an unmyelinated neuron of the digestive tract? b. How long would it take for an action potential to travel the same distance along the axon of a large myelinated neuron innervating a skeletal muscle? c. Suppose there were two synapses in a 0.6 m nerve tract and the delay at each synapse is 1 msec. How long would it take an action potential and chemical signal to travel the 0.6 m now, for both the myelinated and unmyelinated neurons? d. What if there were five synapses?
