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The Endocrine System
Biology 1 Honors
23
Biology
10th Grade
04/11/2011

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Term
The nervous system and the endocrine system
Definition
What 2 systems direct internal control of the body?
Term
endocrine system
Definition
A system made up of a series of glands which release chemicals directly into the bloodstream
Term
interaction
Definition
The functions of all body systems are based on the ________ b/t the nervous and endocrine systems.
Term
hypothalamus
Definition
portion of the brain that connects the endocrine and nervous systems
Term
pituitary
Definition
When a change in homostasis happens, the hypothalamus stimulates the _________ gland.
Term
pituitary gland
Definition
controlled by the hypothalamus, and the two are connected by nerves and blood vessels
Term
dwarfism
Definition
Problems with the pituitary gland result in...
Term
The pituitary gland will then release its own chemicals or stimulate other glands to release theirs.
Definition
In response to the stiumulus from the hypothalamus, the pituitary gland does what?
Term
hormones
Definition
chemicals secreted by endocrine glands into the bloodstream; convey instructions to other cells about your metabolism, growth, development, and behavior
Term
target cells
Definition
Once released by the glands, the hormones travel through the bloodstream, and then attach to binding sites on __________.
Term
human growth hormone (hGH)
Definition
stimulates growth in childhood and is important for maintaining a healthy body composition, and is important for maintaining muscle and bone mass in adults; can affect fat distribution
Term
lowered
Definition
As your body is actively growing, blood glucose levels are slightly ________ as the growing cells use up the sugar
Term
negative feedback system
Definition
an internal feedback mechanism that regulates the endocrine system; the hormones/the effects are fed back to inhibit the orignal signal
Term
stopped
Definition
Once homeostasis is reached, the signal is ________ and the hormone is no longer released.
Term
fed back
Definition
Information regarding the hormone level/effects is ________ to the hypothalamus or pituitary gland to regulate the gland's production of the hormone.
Term
regulation of blood glucose levels and regulation of the endocrine system
Definition
2 examples of a negative feedback system...
Term
insulin
Definition
When you have just eaten, and your blood glucose levels are high, your pancreas releases the hormone _______.
Term
insulin
Definition
a hormone released by the pancreas that signals liver and muscle cells to take in glucose, which lowers glucose levels
Term
glucagon
Definition
a pancreatic hormone released when glucose levels are too low; binds to liver cells, signaling them to release stored glycogen as glucose
Term
adrenal glands
Definition
play na important part for body in stressful situations; located on top of kidneys; two parts (inner & outer portions)
Term
outer portion
Definition
secretes steroid hormones, including glucocoriticoids and aldosterone; causes increase in available glucose and raises blood pressure; helps the body combat stress (fright, extreme temps. bleeding, infection, etc.)
Term
inner portion
Definition
secretes 2 amino acid hormones, epinephrine (adrenaline) and norepinephrine; increases muscle contracton efficiency and blood sugar levels; gets you ready for "flight or fight"
Term
thyroid gland
Definition
located in the neck, regulates metabolism, growth, and development
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