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All glands communicate with each other through chemical messengers called hormones.
Hormones coordinate and control the various organs and tissues of the body. The amount of hormone released depends upon the body's need. The greater endocrine glands are the pituitary, adrenals, thyroid, and parathyroid. Other glands include the adrenals, pancreas, ovaries in women, and testes in men. The glandular system functions properly when it has ample stores of minerals, particularly trace minerals.