Concept explainers
bio Standard electrocardiography measures lime-dependent potential differences between multiple points on the body, giving cardiologists multiple perspectives on the heart’s electrical activity. In contrast, Fig. 22.26 is a “snapshot” showing a more detailed picture at an instant of time. The lines are equipotentials on the surface of a human torso, associated with the heart's electrical activity. Relative to the line marked V = 0, the potential is negative to the upper left (black) and positive to the lower right (color).
From the equipotentials, you can infer that the heart’s electrical structure resembles that of a
- a. uniform charged sheet.
- b. dipole.
- c. point charge.
- d. uniformly charged sphere.
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