2. Membrane Potential Is this membrane polarized or depolarized? A polarized membrane has an imbalance of positive and negative ions on each side. Depolarization enables a signal to be sent along the length of a neuron Polarized
3. Medulla Oblongata The medulla oblongata is a part of the brain stem that controls heart activity
4. SA and AV nodes SA node AV node AV bundle Left and right bundle branches Purkinjie fibres