a cavity or vesicle in the cytoplasm of a cell usually containing fluid

gas phase of an agent that can be compressed to a liquid by pressure, e.g. isoflurane and sevoflurane

narrowing of blood vessels

widening of blood vessels

blood vessel carrying blood towards the heart

the presence of viruses in the blood

the degree of pathogenicity

an microscopic infectious agent that requires the cells of a host animal (or plant) in which to reproduce

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

thin layer of epithelial tissue covering all the organs in the peritoneal cavity

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