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Unformatted text preview: surrounded by parenchymal ground tissue. vascular parenchyma Specialized parenchyma cells in the phloem of plants. vascular plants Group of plants having lignified conducting tissue (xylem vessels or tracheids). vascular system Specialized tissues for transporting uids and nutrients in plants; also plays a role in supporting the plant; one of the four main tissue systems in plants. vas deferens The duct that carries sperm from the epididymis to the ejaculatory duct and urethra. The tube connecting the testes with the urethra. vasectomy A contraceptive procedure in men in which the vas deferens is cut and the cut ends are sealed to prevent the transportation of sperm. Surgical separation of the vas deferens so that sperm, while still produced, do not leave the body. vasopressin See antidiuretic hormone. vectors Self-replicating DNA molecules that can be joined with DNA fragments to form recombinant DNA molecules....
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- Fall '10