The seminal vesicles and the prostate gland play crucial roles in male reproductive physiology. The seminal vesicles produce a viscous fluid that is rich in fructose, which provides energy for the sperm. This fluid makes up a significant portion of semen. The prostate gland secretes a slightly alkaline fluid that helps to nourish and protect the sperm, and it also helps to neutralize the acidity of the female reproductive tract, enhancing sperm viability and mobility.

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Seminal Vesicles: Producing Nutritive Fluid

The seminal vesicles, a pair of small glands located near the base of the bladder, play a vital role in male fertility.

They produce a thick, yellowish fluid that is rich in fructose and other substances. This fluid provides the primary source of energy for sperm cells, enabling them to move and survive. The fluid from the seminal vesicles makes up about 60-70% of the semen volume.

Contribution to Semen Viscosity and Function

The fluid from the seminal vesicles also contributes to the overall viscosity and texture of semen. It contains proteins and enzymes that are crucial for the proper functioning of sperm. The alkaline nature of the fluid helps in neutralizing the acidic environment of the female vagina, which is essential for the survival of sperm in the female reproductive tract.

Prostate Gland: Alkaline Fluid Secretion

The prostate gland, located below the bladder and surrounding the urethra, secretes a slightly alkaline fluid that forms about 20-30% of the semen volume. This fluid plays a key role in sperm nutrition and protection. The alkalinity of the prostate fluid is important for protecting sperm against the acidic environment of the vagina, thereby enhancing sperm motility and longevity.

Role in Ejaculation and Fertility

During ejaculation, the fluid from the prostate gland mixes with the spermatozoa and the fluid from the seminal vesicles to form semen. This mixture is essential for the transport of sperm to the female reproductive tract during intercourse. The fluids from both the seminal vesicles and the prostate gland are crucial for male fertility, as they provide the medium in which sperm can effectively travel and survive.

Enzymatic Content and Sperm Activation

The prostate gland also contributes various enzymes to the semen, including prostate-specific antigen (PSA), which helps in liquefying the semen after ejaculation. This liquefaction is important for freeing the sperm so they can move more easily through the female reproductive tract. The combined secretions of the seminal vesicles and the prostate gland are thus essential for the viability, mobility, and overall functionality of sperm in reproduction.

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Questions of Class 10 Science Chapter 7 in Detail

What is the importance of DNA copying in reproduction?
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What is the role of the seminal vesicles and the prostate gland?
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How does the embryo get nourishment inside the mother’s body?
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Draw a labelled diagram of the longitudinal section of a flower.
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What could be the reasons for adopting contraceptive methods?