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This was achieved by first simultaneously recording membrane potential and [Ca <sup>2+ </sup>] <inf>i </inf> from single isolated SA nodal myocytes and then subjecting the model cell to a combined ;action potential clamp' and ;calcium transient clamp' using a data file with a train of experimentally recorded SA nodal action potentials and ...

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18) During the depolarization phase of an action potential in a neuron: A) K+ ions move from inside to outside the membrane. B) Na+ ions move from outside to inside the membrane. C) The Na/K ATPase pumps Na into the cell. D) K+ and Na+ ions trade places across the membrane. E) Both K+ and Na+ move from outside to inside the membrane

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I show how the greater conductance for Sodium ions in the Pacemaker Cells in the S.A. Node cause the cells to depolarize, opening voltage-gated Calcium channels when the membrane potential reaches threshold. This results in the action potential. Then Potassium channel open, letting Potassium ions leave, repolarizing the cells. Enjoy!

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1.Electrical impulse initiated by the pacemaker SA node spread out of the wall of atrium 2.But are prevented to spread in the walls of ventricles 3.By artrioventricular septum 4.Instead, the impulse will travel to ventricles via the AV node 5.The impulse reach the AV node after 0.3 seconds after being emitted by SA NODE The resting potential is created by a transport protein called the sodium-potassium pump. This protein moves large numbers of sodium ions (Na + ) outside When the Na + ions enter the neuron, the cell's electrical potential becomes more positive. If the signal is strong enough and the voltage reaches a...

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11.The spontaneous fluctuation of resting membrane potential in SA node is mainly due to: A.Na+channels.B.*slow Ca2+channels.C.fast Ca2+channels.D.K+channels. 12.The correct temporal sequence during the cardiac cycle is: 13.Functions of the lymphatic system does NOT include...

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Oct 24, 2020 · In the SA node, the triggering of the action potential depends on calcium channels. If there are more calcium channels available, the threshold potential for triggering the action potential will be lower and so the action potential will be triggered earlier during the pacemaker potential in the presence of nor-epinephrine. SA Node. Pacemaker of the heart ... membrane potential ; ... M.D. November 17th, 2010 Other Sleep Disorders Restless Legs Syndrome Periodic Limb Movements of Sleep ...

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