The main source of physiological secretion found in the vagina is: [AIIMS 98] a. Bartholin's glands b. Gartner's duct c. Vagina d. Cervix The correct answer is d. Cervix. Rationale The Vaginal Dryness: Causes and Moisturizing Treatments Improve Vaginal Lubrication: Tips and Solutions for Women. Female Reproductive Anatomy Biology for Majors II Vaginal discharge is a mixture of fluid comprising bacteria, mucus (liquid) and dead cells secreted by the cervix and vagina to protect the vagina by maintaining the PH, lubricating it, moistening, and Cervical Mucus: What is it, Different Types & What It Means