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1. bulbourethral glands: A pair of exocrine glands near the male urethra. They secrete fluid into the urethra.
Also called Cowper glands.
2. ejaculation: Ejection of sperm and fluid through the male urethra
3. ejaculatory duct: Tube through which semen enters the male urethra.
4. epididymis: One of a pair of long, tightly coiled tubes on top of each testis. It carries sperm from the
seminiferous tubules to the vas deferens.
5. erectile dysfunction: Inability of an adult male to achieve an erection; impotence.
6. flagellum: Hair-like projection on a sperm cell that makes it motile (able to move).
7. fraternal twins: Two infants born of the same pregnancy from two separate egg cells fertilized by two different
sperm cells.
8. glans penis: Sensitive tip of the penis.
9. identical twins: Two infants resulting from division of one fertilized egg into two distinct embryos. Conjoined
twins are incompletely separated identical twins.
10. parenchyma: The essential distinctive cells of an organ. In the testis, the seminiferous tubules that produce
sperm are the parenchymal tissues.
11. penis: Male external organ of reproduction.
12. perineum: External region between the anus and scrotum in the male.
13. prepuce: Foreskin; fold of skin covering the tip of the penis.
14. prostate gland: Exocrine gland at the base of the male urinary bladder. The prostate secretes the fluid part
of semen into the urethra during ejaculation.
15. scrotum: External sac that contains the testes.
16. semen: Spermatozoa (sperm cells) and seminal fluid (prostatic and seminal vesicle secretions).
17. seminal vesicles: Paired sac-like male exocrine glands that secrete fluid (a major component of semen) into
the vas deferens.
18. seminiferous tubules: Narrow, coiled tubules that produce sperm in the testes.
19. spermatozoa: Sperm cell.
20. sterilization: Procedure that removes an individual's ability to produce or release reproductive cells.
21. stroma: Supportive, connective tissue of an organ, as distinguished from its parenchyma.
22. testis: Male gonad (testicle) that produces spermatozoa and the hormone testosterone.
23. testosterone: Hormone secreted by the interstitial tissue of the testes; responsible for male sex characteris-
tics.
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