Step 1: Understanding the Concept:
The question asks for the name of the chemical substances secreted by endocrine glands.
Step 2: Detailed Explanation:
The body has two main types of glands:
1. Exocrine glands: These glands have ducts and secrete substances like enzymes (e.g., salivary glands), sweat, and oil onto a surface.
2. Endocrine glands: These are ductless glands that secrete chemical messengers directly into the bloodstream. These chemical messengers are called hormones. Hormones travel through the blood to target cells and regulate various bodily functions like growth, metabolism, and mood.
Therefore, the secretion of an endocrine gland is a hormone.
Step 3: Final Answer:
The secretion from an endocrine gland is called a hormone.