Write briefly the role of accessory glands in male reproductive system.

1. The secretion of accessory glands provides energy sources for the sperms.
2. Their secretion contributes to the motility and viability of the sperms.
3. The secretion neutralises the acidic effect of the urethra and protects the sperm from inactivation and killing.
4. Their secretion lubricates the external genitalia (penis) at the time of sexual intercourse.
5. Their secretion constitutes about 95% of the volume of semen.