  Embedding theorems, which have a long history in the general theory of
relativity, are used in this paper to account for two of the most troubling
aspects of Morris-Thorne wormholes, (1) the origin of exotic matter and the
amount needed to sustain a wormhole, and (2) the enormous radial tension that
is characteristic of wormholes with moderately-sized throats. Attributing the
latter to exotic matter ignores the fact that exotic matter was introduced for
a completely different reason and is usually present in only small quantities.
