Cambridge Encyclopedia » Cambridge Encyclopedia Vol. 67

semen - Composition of human semen, Semen and transmission of disease, Blood in the semen (hematospermia)

secretions seminal glands spermatozoa

Yellow-white fluid ejaculated from the penis at orgasm. It consists of spermatozoa and the seminal plasma, the secretions from the accessory sex glands (seminal vesicles, prostate, urethral, and bulbo-urethral glands). The secretions assist in the nourishment and motility of the spermatozoa. Fructose is their main source of energy, and prostaglandins facilitate their transport in the female reproductive tract by increasing the motility of the uterus.

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