Classic hormones are chemical signals produced by endocrine glands or cells in one area of the body
Due to their mode of transport, classic
hormones tend to have
effects. Although classic hormones are only secreted from
specific cells or organs, many other chemical signals originate from most other body cells.
are
chemical signals that diffuse short distances, inducing changes in neighboring cells.
act
specifically upon the cells that secrete them.
may act locally or long distance and include
molecules like interferons and interleukins, which are involved with
signals that specifically stimulate cell division, tissue development, and healing.
are