______ is the part of the brain that coordinates voluntary muscle activities.

_______ is the basic building block of the nervous system.

The longest fibre of a neuron is called _______.

Reflex actions are _____ actions.

The brain stem is also known as _____.

________ is the largest region of the brain.

The axon is covered by a sheath called ________.

The membranous covering of the brain is called ________.

Parasympathetic system consists of ______ and ________ nerves.

 Stimuli that arise within the organism are called ______.