featured Endocrine Glands: What Are They?
What is a gland? A gland is a group of cells that produces a hormone—for example, estrogen—that leaves the gland and affects other cells. There are several types of glands: endocrine, exocrine, autocrine, and paracrine. How do glands work? Glands work like the nervous system—they coordinate activities throughout the body. While the nervous system acts quickly but for a short period, glands...
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