Biology 3602A/B Midterm: Midterm: Lecture 11 - Lecture 20
8 Mar 2018
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Note: you are measuring the difference between the positive and negative electrode. Measure the total electric activity of the heart via electrodes on the skin. This is not measuring the membrane potential of the heart. Placement will affect the information it give. Positive on the heart, negative on the other side, and the neutral below it all. This is not measuring the action potential measuring the total electrical activity of the heart. Especially the pacemaker cell it does it the fastest. The funny channel is non-selective for monovalent anions. Depolarization begins at the sa node spreads to the atrial muscle via internodal pathway. Happens because of the funny channel & pacemaker potential. Spread outward due to the gap junctions and intercalated discs in adjacent cells. Atrial depolarization: electrical activity of depolarization produced by atria. Qrs depolarizing from the ventricle because more muscle will cause more depolarization. T wave repolarization of ventricle, read to contract again.
