A bland look-round at some of the body's accomplishments and the latest on what medical science has to offer as assistance. McAleer (The Cosmic Mind-Boggling Book) gives a system by system tour, then looks separately at sex (mostly, notes on fertility and prenatal advances), and transplants (artificial parts included). He starts each section with some gee-whiz facts: ""The brain is a soft lump of tissue, weighing about 3 pounds. . . The brain's outer portions are 85 percent water. . . It also floats in liquid. . . Our thoughts are therefore anchored in a portable ocean."" Trivial odds and ends abound--on childbirth, ""Blonds definitely do not have more fun when it comes to childbirth. Why? Because, on the average, brunettes deliver their babies slightly sooner than do blondes."" McAleer's reports on recent advances are also sketchy; for instance, idle musings on the increasing number of babies born to mothers who are technically dead (about 200 cases have been recorded). Many others have covered the body's workings more thoroughly (Jonathan Miller, for one), and there are many more exciting reports from the medical front (a bit dated already, but still worthwhile is Wasco's Not For Doctors Only). Skip this one.