1. The pituitary gland is called the "master gland" because it controls and regulates the function of other endocrine glands in the body.

2. The endocrine system is also known as the "hormonal system."

3. The two main types of glands in the body are exocrine glands and endocrine glands. Exocrine glands secrete substances onto a surface, such as the skin or mucous membranes, while endocrine glands secrete substances directly into the bloodstream.

4. The adrenal gland is located on top of each kidney.