¿Qué sucede con la saliva cuando esta activo el sistema nervioso simpático?

The answer should be a

Nucleus is the organelle that contains chromosomes

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