what does the seminal vesicle do

The seminal vesicles make much of the fluid in semen and help sperm survive, move, and reach an egg. They add a nutrient-rich, slightly alkaline fluid that contains fructose for energy and other substances that support sperm function.

What they do

• Produce a large share of semen volume, roughly 50% to 80%.

• Supply fructose, which fuels sperm.

• Add alkaline fluid that helps protect sperm from acidity.

• Contribute prostaglandins and clotting factors that support sperm movement and survival.

Why it matters

Without seminal vesicle fluid, semen would be much less effective at carrying and protecting sperm. In simple terms, they help create the “transport liquid” sperm need during ejaculation and early travel through the reproductive tract.

TL;DR

The seminal vesicles mainly make nourishing fluid for semen, helping sperm get energy, protection, and a better chance of reaching an egg.