Transportation of Gametes in the Human Reproductive System:

The human reproductive system involves the transportation of gametes, i.e., sperm in males and eggs in females, from the site of production to the site of fertilization. The transportation of gametes involves various organs and ducts, such as the testes, epididymis, vas deferens, urethra, ovaries, fallopian tubes, and uterus.

Blockage of Vasa Efferentia:

The vasa efferentia are a group of small ducts that connect the testes to the epididymis. These ducts are responsible for carrying the mature sperm from the rete testis to the epididymis, where they undergo maturation and storage. If for some reason, the vasa efferentia get blocked, the transportation of sperm from the testes to the epididymis is hindered. This can lead to various reproductive problems, such as infertility, low sperm count, and low sperm motility.

Consequences of Blockage of Vasa Efferentia:

If the vasa efferentia get blocked, the sperm cannot reach the epididymis, where they undergo maturation and storage. As a result, the sperm may get reabsorbed by the body or get expelled out of the body during ejaculation. This can lead to various reproductive problems, such as:

1. Infertility: The inability to conceive after regular, unprotected sexual intercourse for a year or more.

2. Low sperm count: The number of sperm in the semen is lower than normal, which can reduce the chances of fertilization.

3. Low sperm motility: The ability of the sperm to move towards the egg is reduced, which can also reduce the chances of fertilization.

Conclusion:

In conclusion, the vasa efferentia are a crucial component of the male reproductive system, responsible for transporting the mature sperm from the testes to the epididymis. If these ducts get blocked, the transportation of sperm is hindered, leading to various reproductive problems such as infertility, low sperm count, and low sperm motility.

Option a } testis to epididymis because between them vasa efferentia is present