Endocrine  glands are _______ glands secreting the chemical substance called hormones.

When the impulse is conveyed from a receptors to the main nervous system called a

Which of the following  carries both sensory and motor fibers?

Chemically hormones are _______ amino acids   or steroids.

The main cell body of nerve cell is the

A ________ is formed of a bundle of nerve fibers enclosed in a tubules sheath.