Which of the following does NOT secrete hormones?

The uterus does not secrete hormones in the same way that the other options do. The primary role of the uterus is to provide a nurturing environment for a developing fetus and to facilitate the processes of menstruation and childbirth. While it is affected by hormones and can respond to hormonal signals from other glands, such as estrogen and progesterone, it does not produce or secrete hormones itself.

Conversely, the ovaries, pituitary gland, and pancreas are all endocrine glands that actively produce and release hormones. The ovaries secrete hormones such as estrogen and progesterone, which are crucial for the regulation of the menstrual cycle and reproductive functions. The pituitary gland, often referred to as the "master gland," secretes a variety of hormones that regulate many bodily functions and control other endocrine glands. The pancreas has both exocrine and endocrine functions, including the secretion of insulin and glucagon, which are key in regulating blood glucose levels.

Thus, the uterus stands apart as it is not categorized as a hormone-secreting gland within the body's endocrine system.