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).
82. 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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