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Biology: Life On Earth Ch. 33
Vocab for Ch. 33: Chemical Control of the Animal Body: The Endocrine System
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Biology
10th Grade
03/08/2006

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Term
adrenal cortex
Definition
The outer layer of the adrenal gland, which secretes three types of steroid hormones.
Term
adrenal glands
Definition
Two glands in a single structure atop the kidney.
Term
adrenal medulla
Definition
The region in the center of each adrenal gland, which consists of secretory cells derived during development from nervous tissue, and produces two hormones: epinephrine and, in smaller quantities, norepinephrine.
Term
adrenocorticotropic hormon (ACTH)
Definition
A hormone which causes the relase of the release of the hormone cortisol from the adrenal cortex.
Term
aldosterone
Definition
A hormone secreted by the adrenal cortex which regulates the sodium conent of hte blood.
Term
amino acid based hormones
Definition
Hormones which are synthesized from singel amino acids.
Term
androgens
Definition
The steroid hormones secreted by the testes.
Term
angiotensin
Definition
A hormone that raises blood pressure by constricting arterioles.
Term
anterior pituitary
Definition
The forward lobe of the pituitary
Term
anti diuretic hormone (ADH)
Definition
A peptide hormone synthesized in the hypthalamus and released from the posterior pituitary, that helps prevent dehydration by increasnig the permeability of the colleting ducts of hte kidney.
Term
atrial natriuretic peptide (ANP)
Definition
The peptide released by cells in the atria when blood volume increases, causing extra distension of hte hart.
Term
calcitonin
Definition
A peptide important in calcium metabolism
Term
cholecystokinin
Definition
A hormone produced by the stomach and small intestine that helps regulate digestion.
Term
cortisol
Definition
The most secreted glucocorticoid of the adrenal coretex.
Term
cyclic AMP (cAMP)
Definition
A nucleotide that regulates many cellular activities and is second messenger. It initiates a chain of reactions inside the ell, involving an increasing number of molecules, amplifying the orignal signal.
Term
diabetes mellitus
Definition
A form of diabetes caused by a lack of insulin production or the failure of target cells to respond to insulin.
Term
ducts
Definition
The tubes or openings through which exocrine gland secretions are released.
Term
endocrine disrupters
Definition
Types of foreign substances which block the effects of tosterone or either mimic or block reproductive hormones.
Term
endocrine glands
Definition
Ductless glands which release their hormones within the body, often within a network of apillaries.
Term
endocrine hormones
Definition
Chemical messages produced by specialized cells, often released in response to some stimulus.
Term
endocrine system
Definition
The system consisting of hormones and the carious cells that secrete and recieve them.
Term
environment estrogen
Definition
Foreign substances which mimic the effects of estrogen.
Term
epinephrine
Definition
A hormone produced by the adrenal medulla which prepares the body for emergency action.
Term
erythropoietin
Definition
A hormone produced by the kidneys that increases red blood cell production.
Term
estrogen
Definition
A type of steroid hormone secreted by the ovaries.
Term
exocrine glands
Definition
Glands which produce secretions that are relased outside the body or into the digestive tract.
Term
follicle-stimulating hormone (FSH)
Definition
A hormone prodcuved by the anterior pituitary which stimulates the production of sperm and testosterone in males, and of eggs, estrogen, and progesterone in females.
Term
gastrin
Definition
A peptide hormone produced by the stomach and small intestine which helps regulate digestion.
Term
glucagon
Definition
A peptide hormone produced by an islet cell in the endocrine portion of the pancreas.
Term
glucocorticoids
Definition
The hormones secreted by he adrenal cortex.
Term
goiter
Definition
A condition caused by an iodine-deficient diet which can result in excessive growth of hte thyroid gland.
Term
growth hormone
Definition
A hormone that regulates the body's growth by acting on nearly all the body's cells.
Term
hypothalamus
Definition
A part of the brain that contains clusters of specialized nerve cells.
Term
inhibiting hormones
Definition
Peptides released from the hypthalamus that inhibit he release of hormones from the anterior pituitary.
Term
insulin
Definition
A hormone produced by an islet cell of hte pancreas.
Term
islet cells
Definition
Clusters of cells which produce peptide hormones.
Term
leptin
Definition
A peptide hormone relased by adiposefat cells.
Term
local hormones
Definition
Hormones secreted into the immediate vicinity.
Term
luteinizing hormone (LH)
Definition
A hormone produced by the anterior pituitary which stimulates the production of pserm and testosterone in males, and ofeggs, estrogen, and progesterone, in females.
Term
melanocyte-stimulating hormone (MSH)
Definition
A hormone which stimulates the synthesis of hte skin pigment melanin.
Term
melatonin
Definition
A hormone produced by the pineal gland in a daily rhythm, responding to daylengths and seasons.
Term
neurosecretory cells
Definition
Cells which synthesize peptide hormonse, store them, and release them when stimulted.
Term
norepinephrine
Definition
Ahormone produced by the adrenal medul which prepares the body for emergency action.
Term
ovaries
Definition
The sex organ in females, which is also an important endocrine organ.
Term
oxytocin
Definition
A peptide hormone synthesized in the hypothalamus and released from the posterior pituitary.
Term
pancreas
Definition
A gland that produces both exocrine and endocrine secretions.
Term
parathyroid glands
Definition
Four small discs embedded in the back of hte thyroid gland, which secrete parathyroid hormone to control the concentration of calcium in the blood.
Term
parathyroid hormone
Definition
The hormone secreted by hte parathyroid glands.
Term
peptide hormone
Definition
The class of endocrine hormone made from chains of amino acids.
Term
pineal gland
Definition
A gland located between the two hemispheres of te brain, just above the hypothalamus.
Term
pituitary gland
Definition
A pea-sized gland that dangles from the hypothalams, and consists of two distinct parts.
Term
posterior pituitary
Definition
The backmost part of hte pituitary gland.
Term
progesterone
Definition
A type of steroid hormone secreted by the ovaries.
Term
prolactin
Definition
A hormone that stimulates mammary gland development during pregnancy.
Term
prostaglandins
Definition
Modified fatty acids synthesized by cells from membrane phospholipids, are a type of local hormone.
Term
receptors
Definition
Specialized protein molecules that bind only to specific chemical messengers.
Term
releasing hormones
Definition
Peptide hormones secreted by hte hypthalamus which release hormones which regulate other hormones form the anterior pituitary.
Term
renin
Definition
A hormone produced by the kidneys inresponse to low blood pressure.
Term
second messenger
Definition
A molecule inside a cell that transfers a signla from the ormone to other molecules within the cell.
Term
secretin
Definition
A peptide hormone produced by the stomach and small intestine that helps regulate digestion.
Term
steroid hormones
Definition
Hormones which resemble cholesterol, from which most steroid hormones are synthesized.
Term
target cells
Definition
Certain cells bearing receptors for a particular hormone molecule.
Term
testes
Definition
The male sex organs which are also important endocrine organs.
Term
testosterone
Definition
The most important steroid hormone secreted by the testes.
Term
thymosin
Definition
The hormone produced in the thymus, hwich stimulates the development of specialized white blood cells that play an important role in the immune system.
Term
thymus
Definition
The place where white blood cells are produced, and alos the production site of hte hormone thymosin.
Term
thyroid gland
Definition
The gland located at the front of the neck that produces two major hormones.
Term
thyroid-stimulating hormone (TSH)
Definition
A hormone which stimulates the thyroid gland to relase its hormones.
Term
thyroxine
Definition
An idodine-containing modified amino acid that raises hte metabolic rate of most body cells.
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