The interior of a cell is composed of organelles, the cytoskeleton, and the cytosol. The cytosol often comprises more than 50% of a cell's volume. Beyond providing structural support, the cytosol is the site wherein protein synthesis takes place, and the provides a home for the centrosomes and centrioles.
Epidemiologically definition, the branch of medicine dealing with the incidence and prevalence of disease in large populations and with detection of the source and cause of epidemics of infectious disease. See more.
Both incidence and prevalence are words used in the field of epidemiology. Epidemiology is a branch of medicine that looks at (you probably guessed it) how many people have a particular disease, what the risks are of contracting a disease, what happens to people who get that disease, and ultimately, how to prevent disease from occurring.