In the human immune system by stimulating Lymphocytes T.
It is the hormone thymosin. It is secreted by thymus.
thymosin
Norepinephrine
Norepinephrine
adrenaline gland
Human growth hormone, calcitonin, and parathyroid hormone are all involved. Also estrogen plays an important role, especially significant for women after menopause.
Testosterone and estrogen.
melatonin
The most important role an organism plays in the ecosystem
Thyroxine is the precursor to active thyroid hormone, which is essential for life. Thyroid hormone also plays an important role in brain development. A child with untreated low thyroid hormone (hypothyroidism) will develop a condition known as cretinism, which is marked by severe physical and mental abnormalities.
Estrogen
Insulin