The glands that contribute secretions to sperm are:
1. Seminal vesicles
2. Prostate gland
The combined secretions of the seminal vesicles and prostate gland constitute the liquid component of semen. These secretions fulfill two primary roles:
1. They create a fluid environment facilitating the smooth passage of sperm through the male reproductive system.
2. They provide nutrients (such as fructose) to sperm and neutralize the environment, thus shielding sperm from the acidic conditions within the female reproductive tract.