Match the following medical term with the corresponding definition.
- Chemical substances produced by the body to keep organs and tissues functioning properly.
- A gland that functions to secrete thymosin, which is a hormone the bone marrow needs to produce T cells that work with the immune system.
- An organ that functions in both the digestive and endocrine systems which regulates blood sugar levels.
- A gland that secretes hormones that regulate growth and metabolism.

1. Pancreas
2. Thyroid Gland
3. Hormones
4. Thymus Gland