Two Main Types Of Cells In Nervous System Biology Essay

Two Main Types Of Cells In Nervous System Biology Essay There are two main types of cells in the nervous system. These two types are neurons and neuroglia. A neuron is a nerve cell that transmits impulses of the nervous system. Three main parts make up a neuron: cell body, axon, and dendrite. The cell body of a neuron contains the nucleus and cytoplasm. The axon conducts impulses away from the cell body and is away from the cell body a single slender projection from the cell body. A dendrite sticks out off the cell body. It is shaped somewhat like a tree branch. Neuroglia is a type of connective tissue that supports the neurons. Neuroglia protects the nervous system instead of conducting impulses. Neuroglia use a process called phagocytosis to get rid of any unwanted substances. Neuroglia come in three types; astrocytes, microglia, and oligodendrocytes. Astrocytes are cells that possess many processes for attachment. Astrocytes are more plentiful than any other neuroglia, and are only present in the central nervous system. Astrocytes combined with the walls of a blood capillary, prevent harmful substances from passing from the blood to the brain. Microglia have branch like processes protruding from their bodies. The purpose of microglia is to remove debris, waste products, and pathogens from nervous tissue. Microglia increase in number when there is an injury or infection of the tissue. Oligodendrocytes have processes that protrude from their body and coil around axons. Oligodendrocytes main purpose is to be an electrical insulator and help speed the conduction of nerve impulses. #2 The peripheral nervous system contains twelve pairs of cranial nerves and thirty-one pairs of spinal nerves. The peripheral nervous system transmits sensory and motor impulses to and from the central nervous system and other parts of the body. The peripheral nervous system (PNS) is made of nerves. According to Comprehensive medical Terminology 3rd Edition by Betty Davis Jones, A nerve is a cord like bundle of nerve fibers that transmits impulses to and from the brain and spinal cords to other parts of the body. A nerve is macroscopic (i.e., able to be seen without the aid of a microscope). A ganglion is a knot like mass of nerve cell bodies located outside the CNS. The peripheral nervous system also has afferent and efferent nerves. Afferent nerves are sensory nerves that carry impulses from the body to the central nervous system. Efferent nerves are motor nerves that carry impulses from the central nervous system to the muscles and glands. Efferent nerves make the organs respond to a command by completing an action. There are two smaller nervous systems within the PNS called the somatic nervous system and the autonomic nervous system. The main difference between the somatic and autonomic nervous system is that the somatic nervous system is under voluntary control of the skeletal muscle contractions and the autonomic nervous system operates under involuntary control of the smooth and cardiac muscle as well as glandular activities and secretions. #3 The two main components of the central nervous system are the spinal cord and the brain. There is a protective membrane that surrounds the contents of the central nervous system. The membrane is made up of connective tissue called meninges as well as cerebrospinal fluid. The meninges are made up of three layers of membranes. The first layer is the dura mater. The dura mater is a tough white connective tissue. The second layer of the meninges is the arachnoid membrane. The arachnoid membrane is a thin layer of strands that connect to the innermost layer of meninges. The third layer is the pia meter. The pia meter is bound tightly to the surface of the CNS contents. #4 The brain, one of the organs found in the central nervous system can be divided into four sections. The first section is the cerebrum. The cerebrum controls consciousness, memory, sensations, emotions, and voluntary movements. The second section is the cerebellum. The cerebellum maintains muscle tone and coordinates normal movement as balance. The third section of the brain is the diencephalon which contains the thalamus, and the hypothalamus. The thalamus receives sensory stimuli and relays them to the cerebral cortex. The hypothalamus activates, controls, and integrates the peripheral autonomic nervous system, processes, and some sensory functions like body temperature, sleep, and appetite. The fourth and final section of the brain is the brain stem. The brain stem serves as a pathway for conduction of impulses between the brain and spinal cord. It controls such vital functions as respiration, blood pressure, and hear rate. (Davis Jones, 2008) #5 There are many pathological conditions that one may come across. Following will be a list of the just a few along with a description and treatment options for each. Anencephaly is where a child is born without a brain and spinal cord. It is a congenital disorder. A child born with this disorder cannot live. Anencephaly can be detected during pregnancy by the use of amniocentesis or ultrasonography. Carpal Tunnel Syndrome is pain caused by pinching or compressing of the median nerve. Inflammation and swelling of the tendons is what causes the pinching or compression. The pain of Carpal Tunnel Syndrome is the worst during the night. The inflammation associated with Carpal Tunnel Syndrome is caused by repetitious overuse of the fingers, hands, or wrists. There is a treatment for Carpal Tunnel Syndrome which includes taking anti-inflammatory medication, applying splints, attending physical therapy, and stopping the overuse. If these actions do not fix the problem, surgery may be necessary to relieve the pressure. A cerebral contusion is a bruise of the brain tissue that appears when the brain strikes the inner skull. Cerebral contusions cause swelling of the brain. Symptoms consistent with a cerebral contusion are combativeness, increased intracranial pressure, and altered levels of consciousness. Treatments for cerebral contusions are close observation, hospitalization, maintain cerebral perfusion, and administer corticosteroids, and osmotic diuretics. A headache or cephalagia is another pathological condition. Cephalagia is chronic to acute pain in the cranial cavity. A headache may be the result of a disease or other condition, but may also be benign. Treatment for headaches includes taking a mild analgesic. Petit mal seizures are a type of seizure where there is a sudden short time of unconsciousness. Unconsciousness associated with petit mal seizures last only a few seconds. Signs of a petit mal seizure are blank facial expression or repeated blinking for a short time. Most people suffering from petit mal seizures are small children prior to puberty. Peripheral neuritis is inflammation of one or more peripheral nerves. Other disorders are associated with peripheral neuritis such as trigeminal neuritis, Bells palsy, and carpal tunnel syndrome. Each disorder produces unique symptoms and has different treatments. Neuroblastoma is a malignant tumor in the sympathetic nervous system. Neuroblastoma occurs in the adrenal medulla and usually spreads to the liver, lungs, lymph nodes, and bone. Parkinsons disease is a slow deterioration of the nerves in the brain stems motor system. Signs and symptoms associated with Parkinsons disease are stooped posture, bowed head, shuffling gait, expressionless face, muffled speech, and difficulty swallowing. Treatment for Parkinsons disease is drug therapy, controlling the symptoms, and physical therapy. A surgical technique called a pallidotomy is sometimes used, but is not always successful. Shingles is a viral infection in adults who have had chicken pox. Shingles causes inflammation of the spinal or cranial nerve pathway. Symptoms commonly associated with shingles are server pain, fever, itching, GI disturbances, headache, general tiredness, and increased skin sensitivity. Treatment for shingles includes antiviral medications, analgesics, and corticosteroids. Spinal bifida cystic is a disorder in which the back part of one or more vertebrae is not normally closed. In this opening, cysts come through the fifth lumbar. There are tons of other pathological conditions a person may develop all of which have different symptoms, effects, and treatments.

Privacy And Security Concerns Regarding Health Information Essay

Case 4.8 – E-mail Goes Astray Primarily, the technician is the one responsible for the breach in confidentiality because he was the one who sent out the e-mails. Moreover, he did not seek instructions from Kaiser Permanente regarding the backlogged e-mails. Kaiser Permanente hired the technician to upgrade their system. Therefore, tasks other than doing upgrades should be consulted to the company. The technician should have asked whether the accumulated e-mails in the system should be sent out, and he should have asked what to do with them. However, Kaiser Permanente is partly responsible for the breach, because first and foremost, since they hold millions of private information, they should have made sure that that information would not be compromised. They should have made their system secure and only accessible to Kaiser Permanente personnel. Yes, situations like this discourage subscribers in using the system of Kaiser Permanente. However, the services that Kaiser Permanente offer is of great value and subscribers will not easily discontinue their subscription. But Kaiser Permanente has to ensure their subscribers that this will not happen in the future by informing them what caused the breach and reassuring them that upgrades are being done to improve the security of the system and the privacy of their information. The most important thing to do here is to be honest and at the same time make great efforts to secure the system of the company. Case 4.17 – Patient’s Files Used for Obscene Calls Definitely, background checks should be conducted before hiring new employees because this would ensure the safety of the clients, especially in the health care industry. Employers should be granted access to criminal records for them to be able to identify the extent of the crime that ex-convicts have committed. Cases such as child rape and indecent assault is a serious crime that should not be disregarded when hiring employees, especially when the job requires dealing with other people, children, etc. such as in the health care institution. Former employees who are given access to system information that are confidential, such as passwords, etc. should be screened out from the system. In other words, once an employee is not connected with the institution anymore, his access to the system should be deleted or reset. In this case, the system of the health care institution is at fault because it failed to keep the information confidential and secure. In this case, the hospital is accountable for the actions of the technician. Primarily because they hired an employee without doing background checks, they do not monitor the system, wherein they could have detected that calls were being made and the information of the clients were being accessed, and the system is not 100 % secure. Case 4.44 – University Tightens Computer Security Because of the wide range of subscribers in university medical centers information systems, it becomes vulnerable to hackers. In this case, they hacked into the system and used it to send hundreds of advertisements in their e-mails. The hackers wanted to target the significant number of subscribers in the system. However, the information within the system is not precisely the target of the breach. It is not entirely the medical center’s fault. This is because hackers do what they do. They find ways to get into the system even if security measures were set-up to avoid breaching the security of an information system. Therefore, even if the system is secure, hackers will really find a way to get into the system. The medical center’s fault was that they were not able to detect that the system was being hacked. They should have upgrades in the system, which will be used in monitoring the system and alarming when hackers breach the system.

The Case of American Apparel(a Clothing Manufacturer)

Two Practices in Business related to the topic from Business Magazines. The case of American Apparel(a clothing manufacturer): Charney squarely declares : â€Å"I've had relationships, loving relationships, that I'm proud of. I think it's a First Amendment right to pursue one's affection for another human being. † And he is talking about his staff. He has admitted to having numerous love affairs with colleagues in the past. He is even known to work at office dressed in nothing other than underwear. This attitude in fact percolates to American Apparel’s culture, is almost second-nature for most of the employees and is visible even in the decor of its stores. The stores' white walls are dotted with product shots. Like the company's signature advertisements, these are grainy, seemingly candid photos of young people in various states of undress. Charney has been adept at weaving his libertarian sexual attitude with his progressive labor practices. But to make it the gospel or the bedrock principle for it to be followed by ALL of its employees is another story. In May 2005, he was sued by three women — all former American Apparel employees — who claim they were sexually harassed by him at work. Businessweek spoke to multiple employees of American Apparel to gather an understanding of the under-currents of their workplace. Most stated that the place reeks of a highly sexual atmosphere and they were offended by it. So much so that Mr. Charney himself does not deny a report that precluded the sexual harassment case filed, which reported that he engaged in graphic sexual acts with a female employee in presence of the journalist. Seniors actively pursued sexual relationships with the junior colleagues and rewarded them accordingly. Yet, there are people with sound sense everywhere and there were 3 women employees who complained of sexual harassment. They consequently filed a case against Mr. Charney. He came out in his defense flatly refuting the charges against him and claimed that these 3 women were sub-standard employees and gave no indication before they left that they had felt harassed. By all accounts, the 3 litigants were not involved with him physically. Yet, all 3 accused Mr. Charney of using foul and unparliamentary language frequently when conversing with them. They also said that this offended and shocked them and created â€Å"a hostile work environment. † One of the women stated that her boss made her work life miserable with unwelcome sexual comments and suggestive signals. And she says she was dismissed after she complained. One of the purposes that this case serves is that it clearly illustrates the role of perception of sexual harassment at workplace. Business owners, managers and the business culture they propagate are critical components of any no-tolerance plan regarding sexual harassment. Should harassment occur, evidence needs to be provided that appropriate steps are undertaken to prevent and handle the incident. This is why a sexual harassment policy is critical. However, in American Apparel’s case, instead of a robust policy to take care of any potential sexual harassment case, the CEO of the firm himself indulged in harassing his exployees. This resulted in the perception that has come to be recognized now with the name of American Apparel. The company even maintains a string of apartments in the U. S. and Canada to save money on hotel rooms for obvious purposes. Any potential employee now goes looking for a job in A. A. knowing fully well the attitude of the firm towards sexual and suggestive behaviour in the workplace. Practices in business related to sexual harassment: Sexual harassment training programs: As much as 62% of all US businesses now offer some kind of sexual harassment prevention training programs for employees: managers and subordinates alike. Though not a legal requirement for any business(yet), these programs do tend to serve as an assurance in the minds of the employers that should there be a case of sexual harassment at work, they do have a recourse, a channel to address it. And to protect them in case a lawsuit is filed. Some reports suggest that sexual harassment cases are increasingly on the rise. Not only this, the reports also suggest that the harassment has reached the higher levels of management, as in the case of American Apparel. Keeping this in mind, it becomes all the more imperative and necessary for a firm to adopt a sexual harassment prevention policy. It is imperative that an employee is provided a safe and comfortable environment to work in. In â€Å"Sexual Harassment in the Workplace: A Primer†, Barry Roberts and Richard Mann recommend that businesses need to understand sexual harassment; communicate a policy; enforce a policy; establish procedures; and enforce policy. In that respect, a sexual harassment training program plays an all important role. For a policy or set of grievance procedures to be effective, all employees, from upervisors to line workers, administrators to custodial staff, need to be knowledgeable about the company's policy and grievance procedures. Sexual harassment training needs to be very explicit in explaining the laws pertaining to sexual harassment, clearly define and describe the company’s policy and its grievance procedure. Effective programs reflect good teac hing and learning practices. They are descriptive, intensive, relevant, and positive (Berkowitz 1998): –They require the involvement of all members of a company or school and include family and community members who have an influence on the employees' or students' life. -They offer participatory, problem-based learning experiences that are interactive and actively engage the student in learning. –They are tailored to the â€Å"age, community culture, and socioeconomic status of the trainee and are contextualized to the individual's peer group experiences† (ibid. , p. 3). –They present information from a positive viewpoint, encouraging healthy behavior rather than forbidding poor behaviour.

Critical Analysis of Nature by Ralph Waldo Emerson Essay

As human beings we take everything for granted. We think not of the struggle that nature endures to blossom into something that we can find divine. Nor do we think about the hours and passion that a writer may have put into that piece of literature we pick up and read. We are expectant creatures who complain when it’s too hot outside, not even thinking that, that warmth is keeping us alive, or we get mad when it rains too much, not appreciating it for keeping nature flourishing. Ralph Waldo Emerson talks of humans’ disdain for nature and how detached we have become in his piece â€Å"Nature.† We’ll take a look at Emerson’s opinion on the lack of compassion and awe that mankind has for the world around them. Nature was not uncommon to be a†¦show more content†¦Emerson makes it very clear that it is absurd that we are ungrateful for the flora around us when it is never unkind or unforgiving. Whereas the busy industrialized world will eat you alive, the calm invitation of nature will accept you gladly in its presence every time. He writes about how it is rare for adults to be in awe of nature, and that we need to preserve a sense of childhood within us. The reason being, that children are more prone to the discovery of their surroundings. They have not yet become accustomed to trees blowing in the wind, or water gathering on the ground. They are not annoyed by the sounds of birds, and hold no disgust yet for crawling creatures. They are just simply in wonderstruck by it all, as if it is something too good to be true; this is the virtue that Emerson wants us all to hold dear. As a society, we have gotten so out of touch with the world as it should be, and now it’s all about trying to make everything â€Å"better.† The Swarthmore College of Environmental Studies says that â€Å"It is hard to argue that industrialization has not brought humans a greater ability to manipulate their environment (Industrialization and the Environment).† This is the very thing that Emerson is acting against. We have to get back in touch with nature, because then we will find ourselves closer to God. As it stands right now, it seems we are all trying to play our own â€Å"gods.† WeShow MoreRelated Ralph Waldo Emerson Essay1326 Words   |  6 PagesRalph Waldo Emerson Ralph Waldo Emerson was born on May 25, 1803 in Boston, Massachusetts. Early in his life, Emerson followed in the footsteps of his father and became minister, but this ended in 1832 when he felt he could no longer serve as a minister in good conscience. He experienced doubts about the Christian church and its doctrine. 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Although each of the philosopher’s ideas on the role history plays in several ways, they all believe that its end result is significant in the eventual possibility of political freedom: Hegel discusses the methods of history and the Spirit within it, while Emerson believes in a more universal or individualistic mind and Nietzsche being less historical has moreRead MoreTranscendentalism in Civil Disobedience3710 Words   |  15 PagesDannheisig 1 Jan-Hendrik Dannheisig Susanne Hamscha, M.A. Re(dis)covering America: Emerson, Thoreau, and American Democracy 10 April 2012 Transcendentalism in Civil Disobedience Thoreaus Politics of Individuality and Nature Dannheisig 2 Contents Introduction 1. Transcendentalism a. Nature b. Introspective Conscience and Politics 2. Political Individualism a. Ethical and Political (In)justice b. 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