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Series of organs and glands that secrete hormones into your bloodstream
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January 25, 2016 Journal: What is the function of the
endocrine system?
After you complete this journal, hand in your journals. You should have at least 15 entries.
Introduction to the Endocrine System
Endocrine System Series of organs and glands that
secrete hormones into your bloodstream
What does the Endocrine System control?
1.Growth & development2. Reproduction3. Reducing body stress4. Maintaining water, electrolyte and
nutrient balance5. Regulating cellular metabolism and
energy balance6.Maintain homeostasis
Major Endocrine
Glands
Hypothalamus & Pituitary
Glands
Thyroid & Parathyroid Gland
Capsule
Adrenal Glands
Pancreas
Hormones Chemical messengers released by
endocrine glands that are released into the blood stream and travel all over your body
Cause a widespread response
Neurotransmitters HormonesChemical Messenger Chemical Messenger
Released at chemical synapse
Released into bloodstream
Intended for close target Travels to distant targets
Effect happens quickly Effect takes time
Effect wears off quickly Effect lasts longer
Affects single cell Affects many cells
Chemical Messenger Comparison
How Hormones Work Hormones bind to receptors on the
outside or inside of target cells • If the receptor is on the outside…
It changes cell membrane permeability It changes enzyme activity inside the cell
• If it binds to receptors inside the cell… Its called a steroid Interact directly with the cell’s DNA to change
cell activity
Control of Endocrine Activity
Most endocrine organs are active all the time, but the amount of hormone produced changes
Homeostasis including the amount of hormones produced is regulated through positive and negative feedback loops
Control of Hormones Neural Control
• Hormone levels controlled by the nervous system Ex: Adrenal gland secretes hormones to prolong
sympathetic response Hormonal Control
• Glands are arranged in a hierarchy and each regulate the gland below them in the chain Ex: Hypothalamus controls the pituitary gland which
controls the adrenal gland which produces a hormone called cortisol, which allows humans to deal with stress
Humoral Control• Hormone levels controlled by body fluids
Ex: Pancreas secretes insulin in response to rising blood sugar
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