Endocrine System
The endocrine system is a regulatory system composed of ductless glands that emit chemical messengers known as hormones, which travel throughout the body via the bloodstream and affect distant organs. Ductless glands are known as Endocrine Glands, and they produce hormones directly into the bloodstream for distribution throughout the body. In contrast, exocrine glands have ducts and produce materials into them for delivery to bodily cavities. However, other organs and tissues, like the hypothalamus and thalamus, are not categorized as endocrine glands but do include hormone-secreting cells. As a result, the endocrine system includes both endocrine glands and hormone-secreting cells. Hormones are chemical messengers (aka signal molecules). Hormones are endocrine signal molecules that are released into the bloodstream by endocrine gland cells and then delivered to distant target organs. Hormones are low-molecular-weight, chemically diverse non-nutrient compounds produce...