Final answer:
Male ejaculate contains various substances, including fructose and prostaglandins from seminal vesicles, as well as contributions from the prostate gland and the bulbourethral glands, which aid in sperm nourishment, motility, and the preparation of the urethra.
Step-by-step explanation:
The substances associated with male ejaculate are crucial for both the delivery and sustainability of sperm. The seminal vesicles contribute significantly, providing about 60 percent of the semen volume. This fluid contains fructose, which the sperm's mitochondria use to create ATP for motility, as well as other substances like a coagulating enzyme, ascorbic acid, and prostaglandins, which are local-acting hormones. The prostate gland's contribution to semen includes citric acid, seminalplasmin, and prostate-specific antigen, which play roles in nourishment, sperm motility, and the dissolution of seminal clot. Lastly, the bulbourethral glands secrete a clear mucin that lubricates and buffers the urethra, preparing it for ejaculation.