Las piezas
fundamentales de sistema endocrino son las hormonas y las glándulas. Estos son “mensajeros” del cuerpo, las hormonas
transmiten información e instrucciones entre conjuntos de células.
Una glándula es un conjunto de células que fabrican
y segregan sustancias.
Las glándulas seleccionan y
extraen materiales de la sangre, los procesan y secretan el producto químico
resultante para que sea utilizado en otra parte del cuerpo.
Algunos tipos de glándulas
liberan los productos que sintetizan en áreas específicas del cuerpo.
Por
ejemplo, las glándulas exocrinas,
como las sudoríparas y las salivares, liberan secreciones sobre la piel o en el
interior de la boca. Sin embargo, las glándulas endocrinas liberan más de 20 tipos de hormonas
diferentes directamente en el torrente sanguíneo, desde donde son transportadas
a otras células y partes del cuerpo.
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