Hormone is a chemical messenger secreted from an endocrine gland (ductless glands), which is transported to a distant site from its origin where it produces its action (paracrine action). Based on the chemical structure, hormones can be classified into three groups.
1. Peptide hormones
2. Lipid derivatives (steroid hormones)
Thus, the blanks can be filled with peptide hormones; steroid hormones.