<Tr> <Th_colspan="2"> Sinoatrial node </Th> </Tr> <Tr> <Td_colspan="2"> Figure 1 shows the conduction system of the heart . The SA node is labelled 1 . </Td> </Tr> <Tr> <Th_colspan="2"> Details </Th> </Tr> <Tr> <Th> System </Th> <Td> Electrical conduction system of the heart </Td> </Tr>

Where is the cell body of the neuron that directly causes sa node cells to depolarize faster