What sorts of signals does the brain use to communicate sensations, thoughts and actions?

The chemical and electrical signals are used by brain for communication,sensation and thought. Brain uses electrical signals from communication.

The chemical and electrical signals are used by brain for communication,sensation and thought. Brain uses electrical signals from communication. At the end of a neuron the chemical is set off and the electrical impulse is generated and this transfer the infromation.

Explanation:

"a.) well–developed vascular system."