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Adrenal Medulla

Stuff on the Adrenal Medulla
by

Luis Martinez

on 23 October 2012

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Transcript of Adrenal Medulla

Adrenal Medulla The Adrenal Medulla is the inner part of adrenal glands(located on top of the kidneys) that consists of irregular shaped cells grouped around blood vessels
It is connected with the sympathetic division of the autonomic system Hormones Hormones Epinephrine
(Adrenaline) Norepinephrine
(Nonadrenaline) Neurotransmitter Increases blood pressure Increases heart rate Constricts blood vessels Dialates air passages This hormone is secreted in the adrenal medulla as a result of fear or injury
It is part of the sympathatic system and works against norepinephrine to achieve homeostasis 80% Epinephrine and 20% norepinephrine
These hormones are a part of the "fight or flight" response Both hormones are a form of amine called catecholamine The autonomic nervous system affects heart rate, digestion, respiratory rate, salvation, perspiration, urination, and sexual arousal.
It is divided into the sympathetic and parasympathatic nervous systems that works against each other to achieve homeostasis Sympathetic nervous system promotes "fight or flight", arousal and energy generation, orgasm, and inhibits digestion
"Fight or Flight" has a positive feedback loop on epinephrine and a negative feedback loop for norepinephrine Parasympathetic promotes "rest and digest", returning nerves to regular function, sexual arousal, and enhancing digestion
"Rest and Digest" has a negative feedback loop on epinephrine and a positive feedback loop for norepinephrine This hormone is secreted when people need to chill and get back to business
It is a part of the parasympathetic system and works againt epinephrine to achieve homeostasis This hormone targets heart, broncioles and blood vessels
It targets these organs and tissues to bring more blood flow to the rest of the body Same target cells as epinephrine
It is part of the parasympathetic system and its job most of the time is to reverse affects of epinephrine Diseases Hypersecretion Hyposecretion This means too much secretion This means too little secretion Addison's Disease is an example of hyposecretion in the Adrenal glands, but it is the Adrenal Cortex's problem Pheochromocytoma, Cushing's Syndrome, and Hyperaldosteronism cause hypersecretion in the adrenal glands but only Pheochromocytoma starts in the Adrenal Medulla Pheochromocytoma What is it? What Causes it? What can be done? It is a tumor of chromaffin cells in the Adrenal Medulla
It secretes excessive amounts of catecholamines(epinephrine and norepinephrine)
Some symptoms include faster heart rate, high blood pressure, anxiety, diaphoresis(excessive sweating), headaches, and weight loss It is not known well why people get this disease
Most likely it is inheritance because it makes it a 10 to 20 percent chance someone will get the disease Well like most tumors you can get it surgically removed
The process of removing an adrenal gland is called adrenalectomy, which is what is most likely going to happen through surgery
Last two options are chemotherapy and radiation therapy http://www.creationofman.net/chapter3/chapter3_13.html http://wikis.lib.ncsu.edu/index.php/Alfaro,_Sills,_Rose http://www.creationofman.net/chapter3/chapter3_13.html http://www.differencebetween.net/science/health/difference-between-epinephrine-and-norepinephrine/ http://www.simplypsychology.org/stress-biology.html http://radiopaedia.org/encyclopaedia/quizzes/all/10816
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