The male reproductive system is composed of many components. Rete testis can be best defined as the tubules that carry sperms from the seminiferous tubules to efferent ducts. They are located at the cranial pole of the testis. It helps to mix the sperm cells in the fluid secreted by Sertoli cells.

What is fertilisation? State its significance.

Fertilisation: Fertilisation is a process in which a haploid male gamete (sperm) fuses with a haploid female gamete (egg cell) to form a diploid zygote. In humans, fertilisation occurs in the fallopian tube of the female reproductive tract. Significance of fertilisation: Fertilisation restores the diploid number of chromosomes in a zygote. This process helps in the determination of the sex or gender of the foetus. It helps in the combination of the characters of two parents results in genetic variation among the offspring. This phenomenon has a significant role in evolution.

How is polyspermy prevented during fertilisation?

Polyspermy is a phenomenon in which the ovum is fertilized by more than one sperm which should be prevented to maintain the diploid status of the fertilized egg (zygote). Once the sperm enters the ovum, the entry of other sperms is prevented either by increasing concentrations of cytoplasmic Ca 2+ or by the formation of a fertilization membrane by cortical granules. The egg membrane becomes thick during the cortical reaction due to cortical granule exocytosis. Thus, monospermy is maintained and polyspermy is prevented.