The Thorax Acts As A Volume Conductor

The tissues of the body are bathed in an ionic fluid that is conductive to electricity. Therefore, the thorax becomes a volume conductor in which currents are free to flow in three dimensions. This can be contrasted with a linear conductor such as a wire in which current flow is limited to movement along its length. Current flows within a volume conductor whenever a dipole exists within the volume conductor. A dipole can be defined as a separation of charge in space. It is a vector quantity whose magnitude is the charge difference times the distance between the two points of charge (poles). Its direction is determined by the orientation of a line between the two poles. An ordinary flashlight battery is a good example of a dipole. One end is positively charged and the other end is negatively charged. If the battery were to be suspended in a tank of saltwater, current would flow from the positive end to the negative

A2 Half of muscle cells depolarized

A2 Half of muscle cells depolarized

Stimulate

A3 All muscle cells depolarized

A4 Half of muscle cells repolarized leaa

A3 All muscle cells depolarized

A4 Half of muscle cells repolarized

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