The name of chemicals that are secreted by glands into the blood and those that affect organs elsewhere in the body are known as Hormones.
What is Gland?
A Gland may be defined as an organ in the human or animal body that perspires certain chemical substances for usefulness in the body or for liberation into the surroundings.
The endocrine glands are responsible for the synthesis of such chemical substances into specific body parts and organs and pass them directly into the bloodstream. These chemical messengers are thought to be the agents of communication between one body part and another.
Therefore, it is well described above.
To learn more about Endocrine glands, refer to the link:
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