Hormones are chemical messengers released directly into the bloodstream by endocrine glands, transported via the blood to target cells or organs.
Las hormonas son mensajeros químicos liberados directamente en el torrente sanguíneo por las glándulas endocrinas, transportados por la sangre a las células u órganos diana.
| Front | Examples of endocrine glands; thymus gland |
|---|---|
| Back | forms thymosin which controls production of WBCs |
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