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What important contribution did Heraclides of Pontus make to the field of astronomy in the fourth century b.c.e.?
Melatonin
A hormone produced by the pineal gland that regulates sleep and wakefulness cycles.
Thyroid Hormones
Hormones produced by the thyroid gland, including thyroxine (T4) and triiodothyronine (T3), vital for regulating metabolism, growth, and development.
Thymosin
A hormone secreted by the thymus gland, involved in the maturation of T cells, which are critical to the adaptive immune response.
Immune System
A complex network of cells, tissues, and organs that work together to defend the body against infections, diseases, and foreign substances.
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