nerve fibres that carry impulses from an organ to the central nervous system

any of the body systems made up of internal organs, e.g. digestive and respiratory systems

volume of air that can be exhaled after the deepest possible inspiration; it is the usable air in the respiratory system

a number of unrelated organic compounds essential in small amounts for normal metabolism

making sounds

matter from the stomach that returns against the normal direction of peristalsis and may be ejected from the mouth by vomiting