The correct answer is option 3 - Reproductive system. Cowper`s glands, also known as bulbourethral glands, are small glands located beneath the prostate gland in males. These glands are a part of the male reproductive system.
Cowper`s glands secrete a fluid called pre-ejaculate or pre-cum, which is released during sexual arousal. This fluid acts as a lubricant for the urethra and neutralizes any acidic urine residue, creating a more conducive environment for sperm to survive in.
The digestive system (option 1) is responsible for the digestion and absorption of food, it does not include Cowper`s glands.
The endocrine system (option 2) is a collection of glands that produce hormones, such as the pituitary gland and the thyroid gland. Cowper`s glands are not a part of this system.
The nervous system (option 4) includes the brain, spinal cord, and nerves, which transmit signals throughout the body. Cowper`s glands do not play a role in the nervous system.
Therefore, Cowper`s glands are specifically associated with the reproductive system.