The gland that secretes Oxytocin hormone is [A] Pituitary. Oxytocin is produced by the hypothalamus and then transported and stored in the posterior pituitary gland. Upon stimulation, oxytocin is released into the bloodstream. It plays vital roles in reproductive functions and social bonding. During childbirth, oxytocin stimulates uterine contractions, aiding in labor and delivery. Additionally, it facilitates milk ejection (let-down reflex) during breastfeeding by causing contraction of the myoepithelial cells surrounding mammary gland alveoli.

Oxytocin also influences social behaviors and emotional bonding, playing a role in maternal-infant attachment, romantic attachment, and trust. While the pineal gland primarily secretes melatonin to regulate sleep-wake cycles, the adrenal gland secretes hormones like cortisol and adrenaline in response to stress. The ovary secretes hormones such as estrogen and progesterone, crucial for reproductive functions and menstrual cycle regulation.