Hormones are released directly into the blood from ENDOCRINE GLANDS.
- These are ductless glands - consist of cells that produce and release a hormone into the blood capillaries running through the gland.
ENDOcrine glands - Release/SECRETE HORMONES directly into the BLOOD.
EXOcrine glands - Do NOT release hormones. Have a small tube/DUCT that carries their SECRETION to another place.
Hormones = Molecules that are released by endocrine glands directly into the blood.
- They act as MESSENGERS carrying a signal from the endocrine gland to a SPECIFIC target organ or tissue.
Cells receiving a hormone signal must possess a COMPLEENTARY RECEPTOR on their plasma membrane. The hormone BINDS to the receptor.
TARGET CELLS = Cells possessing specific receptors on their cell surface membrane.
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