Answer :
Endocrine cells, which create hormones that are transported throughout the body by the bloodstream, are best able to transmit a signal that needs to be sent to the entire body.
The bloodstream carries the hormones that the endocrine glands produce throughout the body.
Exocrine hormones are secreted into a duct before entering the bloodstream, whereas endocrine hormones are released into the blood and transported by blood and tissue fluids to the cells they operate upon.
Animal hormones, in contrast to plant hormones, are frequently (though not always) created in specialized glands that synthesize hormones (shown below). In the bloodstream, where they travel throughout the body, the hormones are then produced from the glands.
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