In an electrocardiograph a wave of sustained depolarization moving towards a negative electrode will produce:
a.
downward deflection
b.
upward deflection
c.
no deflection
d.
up then down deflections
e.
down then up deflections
downward deflection
b.
upward deflection
c.
no deflection
d.
up then down deflections
e.
down then up deflections