THE ENDOCRINE SYSTEM
o Enables organs and system in the body to respond to stimuli as a whole
o Made out of ENDOCRINE GLANDS which secrete chemical messengers,
HORMONES
o Causes a longer lasting, widespread response
o Influences all metabolic reactions
o Conducts information slowly
2 TYPES OF GLANDS:
ENDOCRINE GLANDS EXOCRINE GLANDS
− Ductless − Ducted
− Poor directly into blood − Secretions go through ducts into
organ
− eg. thyroid − eg. salivary
NOTE:
− Pancreas is BOTH an endocrine and exocrine gland
− ENDOCRINE—>secretes hormones: insulin and glucagon
− EXOCRINE—>secretes digestive enzymes
HORMONES: chemical messengers which are transported by blood and have
long term effects.
1. Mostly protein in nature-->only some are lipids (i.e.: steroids and testosterone)
2. Transported in the blood
3. Produce specific regulatory effects in specific tissues/organs-->Target cells/organs
o Enables organs and system in the body to respond to stimuli as a whole
o Made out of ENDOCRINE GLANDS which secrete chemical messengers,
HORMONES
o Causes a longer lasting, widespread response
o Influences all metabolic reactions
o Conducts information slowly
2 TYPES OF GLANDS:
ENDOCRINE GLANDS EXOCRINE GLANDS
− Ductless − Ducted
− Poor directly into blood − Secretions go through ducts into
organ
− eg. thyroid − eg. salivary
NOTE:
− Pancreas is BOTH an endocrine and exocrine gland
− ENDOCRINE—>secretes hormones: insulin and glucagon
− EXOCRINE—>secretes digestive enzymes
HORMONES: chemical messengers which are transported by blood and have
long term effects.
1. Mostly protein in nature-->only some are lipids (i.e.: steroids and testosterone)
2. Transported in the blood
3. Produce specific regulatory effects in specific tissues/organs-->Target cells/organs
