Endocrine glands secrete hormones

Some endocrine cells exist as single cells within a tissue. Many hormones of the digestive tract, for example, are secreted by isolated endocrine cells in the wall of the stomach and small intestine.

Many hormones, however, are secreted by aggregations of endocrine cells that form secretory organs called endocrine glands. The name "endocrine" reflects the fact that these glands do not have ducts that lead to the outside of the body; rather, they secrete their products directly into the extracellular fluid. Vertebrates have nine major endocrine glands, which collectively make up the endocrine system (Figure 42.2). A single endocrine gland may secrete several different hormones.

What Are Nine Glands The Hormones
42.2 The Endocrine System of Humans There are nine major glands in the human endocrine system, but hormones are also secreted by endocrine cells that are not part of discrete glands.

Was this article helpful?

0 0
100 Pregnancy Tips

100 Pregnancy Tips

Prior to planning pregnancy, you should learn more about the things involved in getting pregnant. It involves carrying a baby inside you for nine months, caring for a child for a number of years, and many more. Consider these things, so that you can properly assess if you are ready for pregnancy. Get all these very important tips about pregnancy that you need to know.

Get My Free Ebook


Responses

  • ahmad
    What are nine glands in the hormones?
    8 years ago
  • Ursula
    What organs make up the endocrine system?
    8 years ago
  • maura
    How many endocrine gland do human have?
    8 years ago
  • meeri
    What are 9 glands of the endocrine system?
    7 years ago

Post a comment