In which one of the following pairs the two items mean one and the same thing?
1. Malleus - anvil
2. SA node - pacemaker
3. Leucocytes - lymphocytes
4. Haemophilia - blood cancer
In the nodal tissue of the human heart, the highest conduction velocity is seen in:
1. Internodal pathway
2. AV node
3. AV bundle or Bundle of His
4. Purkinje fibers