Depolarization of the atria is followed by depolarization of the ventricles. Given that the mass of the ventricles is much greater than the mass of the atria, which of the following ismostly likely to be true?

1. Thevector dipole of the ventricles will be positive for a much longerduration than the vector dipole for the atria.
2. Thevector dipole of ventricle depolarization will be much larger thanthe vector dipole of atria depolarization.
3. Thevector dipole of atria depolarization will be much larger than thevector dipole of ventricle depolarization.
4. Thevector dipoles of the atria and the ventricles will be similar insize because the dipole size depends on the voltage generated, notthe mass of tissue.