. . "Reproduction." . . . . . . . . . . . "Illustrates the internal and external male and female reproductive organs. Details the physiology of the hormone secretions that control these organs and depicts the union of sperm and ovum."@en . . "The human reproductive systems"@en . . "The Human reproductive systems"@en . . "Sitemas reproductivos de los seres humanos"@en . . "Illustrates the internal and external male and female reproductive organs. Details the physiology of the hormone secretions that control these organs. Union of the sperm and ovum is described."@en . . "The Human reproduction systems"@en .