One of the most important tasks of the male reproductive system is the production of liquid which is termed as seminal fluid. This is the one that goes out with the sperm when it is propelled towards the outside of the body during ejaculation. In many mammals, including humans, the majority of the seminal fluid is produced on the seminal vesicle. The organ is composed of two vesicles, which are actually glands that are around two inches or about five centimeters long. They are located behind the human bladder. The amount of seminal fluid that is produced by each species of mammal varies; but in humans, the average was determined to be at sixty percent for the two vesicles.
The length of each of the seminal vesicles can be deceiving, because the long tubules are folded in a compact manner. These tubules are connected to the vas deferens, which is another tube that is used for the transfer of sperm from other reproductive parts of the male system. Should there be an ejaculation, the majority of the ejaculated semen is a combination of sperm and the fluids. The fluid from the seminal vesicle has several functions that are essential, though not always necessary for fertility or ejaculation. The components mix in with seminal fluid that came from the prostate gland. The two fluids have been found to have opposite pH; and even if combined together, they still tend to be highly alkaline. They provide a closer balance, though, than what can be had if only one of the fluids is present.
There are also essential nutrients that are on the fluid produced by the seminal vesicles. One of these nutrients is fructose, which is a form of sugar that is used by the traveling sperm for energy. It has been noted, though, that the sperm that reaches the vagina early do not necessarily come in contact with the seminal vesicle fluid.