What is the endocrine system made up of?
Made of glands that secrete substances into the bloodstream.
(exocrine glands secrete substances into ducts)
What is the function of the endocrine system?
-Communication and control
-Same functions as nervous system, but works slower
How do hormones cause change?
-Hormones are CHEMICALS released from one part of the body and carried through the BLOODSTEAM to affect another part of the body.
-Hormones are released in SMALL QUANTITIES and are VERY SPECIFIC
-Needs to connect to the specific type of target cell’s receptors to affect cells. Target cells have receptors for specific hormones.
What are the two types of glands of the endocrine system?
- Endocrine glands
- Exocrine glands
Exocrine glands?
-Glands that secrete into ducts or tubes that lead to the body surface
-they secrete externally
-They deliver their products directly to a specific site
Difference btwn how endocrine and exocrine glands secrete
endocrine glands: secrete hormones into body fluids
exocrine glands: secrete substances into outside environment
Endocrine glands?
- The cells, tissues, and organs that make up the endocrine system
-They are ductless
-they secrete hormones into the bloodstream
-“endocrine” means “internal secretion.”
Are the major endocrine glands physically connected?
no
what are examples of the larger endocrine glands that produce hormones?
-hypothalamus
-pituitary gland
-thyroid gland
-adrenal glands
-pancreas
Where are hormones released
into extracellular spaces around endocrine cells. hormones diffues into the bloodstream for distribution around the body
Are some hormones produced by small groups of special cells?
yes
What changes do hormones produce (one or more) in target cells
- alter plasma membrane permeability, potential, or both
- stimulate protein synthesis
3.activate/deactivate enzymes - induce a secretory activity
- stimulate mitosis
