Sugar fructose is present in the secretion of

A) Prostate gland

B) Perineal gland

C) Cowper’s gland

D) Seminal vesicles

Fructose is a simple ketonic monosaccharide commonly found in plants, often bonded with glucose to form the disaccharide sucrose. It is one of the three main dietary monosaccharides—along with glucose and galactose that are absorbed directly into the bloodstream during digestion.

In the male reproductive system, the accessory glands include the paired seminal vesicles. Each seminal vesicle is a narrow, muscular sac located between the urinary bladder and the rectum. Its secretion is rich in fructose, which serves as the primary energy source for sperm cells. This secretion contributes to the formation of semen.

Approximately 60% of semen is produced by the seminal vesicles. Their secretion makes up the bulk of seminal fluid and contains:

• Fructose (energy source for sperm, comprising up to 99% of the reducing sugars in semen),
• Proteins,
• Citric acid,
• Inorganic phosphorus and potassium,
• Prostaglandins (support sperm mobility and viability).

The fluid is viscous and plays a crucial role in sperm survival and function. Proteins within the secretion also contribute to slight coagulation of semen after ejaculation.

Although fructose testing is not part of a routine semen analysis, it is helpful in diagnosing conditions such as azoospermia (absence of sperm in semen).

Correct answer: Option (D)