Final answer:
The two hormones secreted by the posterior pituitary gland are antidiuretic hormone (ADH) and oxytocin. They belong to the peptide hormone class.
Step-by-step explanation:
The two hormones secreted by the posterior pituitary gland are antidiuretic hormone (ADH), also known as vasopressin, and oxytocin. These hormones are produced by neurons in the hypothalamus and transported to the posterior pituitary where they are stored and released into the bloodstream when needed.
ADH regulates water balance by controlling the reabsorption of water by the kidneys, thus helping to maintain blood volume and osmotic pressure. Oxytocin, on the other hand, stimulates uterine contractions during childbirth and promotes the ejection of milk during breastfeeding.
These hormones belong to the peptide hormone class, which is water soluble.