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Endocrine glands secrete hormonesdirectly into the bloodstream. Thehormones dissolve in plasma and travel the circulatory pathways through various body tissues. ... Because only those target cells have receptors for that particular hormone. Somehormones bind to receptors on the surface of target cells.
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Exocrine gland. ... Examples ofexocrine glands include sweat, salivary, mammary, ceruminous, lacrimal, sebaceous, and mucous.Exocrine glands are one of two types of glands in the human body, the other being endocrine glands, which secrete their products directly into the bloodstream.
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sense organs
sensory nerve
brain
motor nerve
effectors