Which nervous system is responsible for preparing the body for defensive action?

It's the Peripheral Nervous System. Specifically the Sympathetic Nervous System(which is also called Autonomous Nervous System).

The proton has a positive charge while the neutron has no charge they both make up the nucleus of the atom while the elections have a negative charge and surround the nucleus of the atom. the protons and electrons are used to calculate the atom's mass whereas the neutrons don't affect the mass