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Which nutrient in seminal-vesicle fluid provides energy for sperm?

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Front view anatomical diagrams of the male and female reproductive systems, with labeled organs including penis, testis, prostate gland, uterus, ovary, and vagina. — human reproductive system Organs and structures of the male and female reproductive systems.

The nutrient in seminal-vesicle fluid that serves as the primary energy source for sperm is fructose.12

Once the fluid from the seminal vesicles combines with sperm in the ejaculatory duct, this sugar acts as the main nutrient to support sperm motility outside the body.12