The thyroid, parathyroid, and thymus are located in the .
The adrenals, pancreas, testes, and ovaries are located in the .
The pineal, hypothalamus, and pituitary are located in the .
This structure secretes glucagon and insulin.
This structure regulates the development and differentiation of T lymphocytes.
This structure regulates blood calcium levels.
secrete mucus for protection.
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