Which of the following glands does NOT act as an exocrine gland?

The pituitary gland is correctly identified as not acting as an exocrine gland because it is classified as an endocrine gland. Endocrine glands release hormones directly into the bloodstream rather than through ducts, which is characteristic of exocrine glands. The pituitary gland plays a crucial role in regulating various physiological processes by secreting hormones that control growth, metabolism, reproduction, and other functions throughout the body. In contrast, the salivary gland, pancreatic gland, and liver release their secretions through ducts: the salivary glands secrete saliva into the mouth, the pancreatic gland produces digestive enzymes for the small intestine, and the liver produces bile that is stored in the gallbladder before being released into the digestive tract. Understanding the distinctions between endocrine and exocrine functions helps in recognizing the roles of various glands in the body.