+ 1-888-787-5890  
   + 1-302-351-4405  
 
 
 
 

Essay/Term paper: Myasthenia gravis

Essay, term paper, research paper:  Science Research Papers

Free essays available online are good but they will not follow the guidelines of your particular writing assignment. If you need a custom term paper on Science Research Papers: Myasthenia Gravis, you can hire a professional writer here to write you a high quality authentic essay. While free essays can be traced by Turnitin (plagiarism detection program), our custom written essays will pass any plagiarism test. Our writing service will save you time and grade.

In 1890, German medical professor Wilhelm Erb and other physicians had been observing several cases of a neuromuscular disease that they believed was affecting how nerve impulses were transmitted to muscle at the neuromuscular junction. The patient"s experienced a "grave muscular weakness" and Wilhelm named it myasthenia gravis. Through further research, the physicians discovered whether it affected the eye muscles first, or created difficulty in talking, chewing and swallowing, or in using the arms and legs it was neither hereditary nor contagious. Their discoveries lead to more detailed research.
In the early 1970s when Muscular Dystrophy Association, using snake venom, observed that patients with the disease had decreased numbers of acetylcholine receptors. Thus, discovering that the disease affected acetylcholine receptors of the skeletal muscles. The Muscular Dystrophy Association also found that, in rabbits, an immune attack against the acetylcholine receptors resulted in muscle membrane damage that is similar to that seen in human myasthenia gravis. This rabbit experiment was responsible for a large portion of what scientists now know about myasthenia gravis.
Myasthenia gravis causes a progressive and abnormally rapid fatigue of the voluntary muscles. It is known as an autoimmune disease, in which the body generates an immune system attack against its own skeletal muscles. This arises when lymphocytes in the blood produce antibodies that destroy muscle-cell receptors for acetylcholine molecules, preventing muscle contractions. The antibodies have been shown to decrease the usefulness of acetylcholine receptors through accelerated endocytosis and blockade of the receptor. Endocytosis is when extracellular substances are being incorporated into the cell by vesicles forming inward through budding of the plasma membrane. Researchers have been able to demonstrate the effect of antibodies on acetylcholine receptor by using radioactively labeled alpha bungaroo toxin, a snake poison, to follow the rate of degradation. Antibodies from patients with myasthenia gravis cause an increase in the rate of degradation of acetylcholine receptors. Blockade of acetylcholine receptors is another form of autoimmune attack from myasthenia gravis. Antibodies from these patients have been shown to block the acetylcholine binding sites preventing acetylcholine from binding to its receptor and opening the ion channel. The antibodies may bind near the acetylcholine binding site rather than directly on it, because the acetylcholine binding site is so small. In this case, the antibodies would prevent acetylcholine from binding at the receptor by interfering with the acetylcholine molecule as it moves towards its receptor.
Symptoms for some one with myasthenia gravis include a flattened smile and droopy eyes, with slow pupillary light responses. The person with myasthenia gravis, myasthenic patient, may have fixed column deformity or irregular posture after standing for a short time period. Nasal speech, difficulty chewing and swallowing, dulled facial expression, including difficulty smiling and an ineffective cough due to weak expiratory muscles, are all also frequently associated with myasthenia gravis. The degree of muscle weakness involved in myasthenia gravis varies greatly among patients. However, the myasthenic patient has no loss of reflexes or alteration of sensation or coordination and generally doesn"t complain about feelings of fatigue. Instead, they experience localized fatigue in specific, repeatedly used muscle groups.
Who gets myasthenia gravis? Myasthenia gravis occurs in all ethnic groups and both genders. It most commonly affects young adult women, under 40, and older men, over 60, but it can occur at any age. Studies showed that women were often affected more than men were. Now, males are more often affected than females, and the onset of symptoms is usually after age 50. In birth development stages, the fetus may acquire antibodies from a mother affected with myasthenia gravis. Generally, cases of neonatal myasthenia gravis are temporary and the child"s symptoms usually disappear within a few weeks after birth. Other children develop myasthenia gravis indistinguishable from that seen in adults. Myasthenia gravis in juveniles is common. As Professor Wilhelm Erb discovered myasthenia gravis is not directly inherited nor is it contagious. Occasionally, the disease may occur in more than one member of the same family. Children rarely develop myasthenia gravis; instead, they may show signs of congenital myasthenia or congenital myasthenic syndrome. These are not autoimmune disorders, but are caused by defective genes that control proteins in the acetylcholine receptor or in acetylcholineterase.
More and more research is conducted everyday in search of a cure for myasthenia gravis. One main contributor to the awareness of this disease is the Myasthenia Gravis Foundation of America. It is a national volunteer health agency dedicated solely to the fight against myasthenia gravis. As technology increases, hopefully some one will find a cure.

 

Other sample model essays:

Introduction to viruses: For centuries submicroscopic organisms, also known as viruses, that grow and multiply at different rates inside of a cell, have been circulating our planet.1 The cell prod...
Biology / Mythology
Greek Mythology Mythology is a way that the ancient societies explained why things are the way they are and how they came to being. Two ancient societies are infamous for their mythology. The...
Science Research Papers / Narcotics
Narcotics: Narcotics decrease the sensitivity to the sensory stimuli because it has a depressant effect on the central nervous system. Opium, morphine, codeine, heroin, meperidine, and methadone a...
Science Research Papers / Nationalism In The Global Village
INTRODUCTION With the dawning of the information age there has been a shrinking of relative distances between people and places all over the world. With an increase in international communication...
Necrotizing Fasciitis is also known as the flesh-eating disease. It is a rare disease that causes the deterioration of the flesh, causing extensive destruction of the tissues. It can kill. The dise...
A neuropsychologist is a psychologist who specializes in studying brain behavior relationships. Neuropsychologists have extensive training in the anatomy, physiology, and pathology of the nervous sys...
The sought to determine the effects of mixing various levels of acids and bases to see which combination would have the most explosive reaction, and measure the resulting pH levels. I did this by test...
Science / Nikola Tesla
"Were we to seize and eliminate from our industrial world the results of Mr. Tesla's work, the wheels of industry would cease to turn, our electric cars and trains would stop, our towns would...
Nitrate Contamination of Groundwater Poses a Serious Health Threat Nitrates contamination of the world's underground water supply poses as a potentially serious health hazard to the human inha...
Science / Nitrogen
Nitrogen was isolated by the British physician Daniel Rutherford in 1772 and recognized as an elemental gas by the French chemist Antoine Laurent Lavoisier about 1776. Properties Nitrogen is a col...
Experience with Dream Essay - Reliable and great customer service. Quality of work - High quality of work.
Browns Mills, New Jersey, United States
Dream Essay - Very reliable and great customer service. Encourage other to try their service. Writer 91463 - Provided a well written Annotated Bibliography with great deal of detail per the rubric.
Browns Mills, New Jersey, United States
it is always perfect
Frederick, Maryland, United States
The experience with Dream Essay is stress free. Service is excellent and forms various forms of communication all help with customer service. Dream Essay is customer oriented. Writer 17663 is absolutely excellent. This writer provides the highest quality of work possible.
Browns Mills, New Jersey, United States
Only competent & proven writers
Original writing — no plagiarism
Our papers are never resold or reused, period
Satisfaction guarantee — free unlimited revisions
Client-friendly money back guarantee
Total confidentiality & privacy
Guaranteed deadlines
Live Chat & 24/7 customer support
All academic and professional subjects
All difficulty levels
12pt Times New Roman font, double spaced, 1 inch margins
The fastest turnaround in the industry
Fully documented research — free bibliography guaranteed
Fax (additional info): 866-332-0244
Fax (additional info): 866-308-7123
Live Chat Support
Need order related assistance?—Click here to submit a inquiry
© Dreamessays.com. All Rights Reserved.
Dreamessays.com is the property of MEDIATECH LTD