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Skeletal muscle
Skeletal muscle
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Lecturer
Name
The skeletal muscle is a body muscle made up of elongated and transversal fibres, nucleated, and consists of blood vessels. It is a collection of voluntary muscles that are found at either one or both extremes of every bone structure in the body. Individual skeletal muscle fibres are surrounded by irregular reticular and collagen fibres also known as endomysium. The whole muscle is covered apart from the tendon junction. The skeletal muscles form forty to fifty percent of the human body with close to 400 in an average human’s body. It performs two actions; they are flexors and extensors. Flexing involves decreasing the size of the joint angle while extension involves increasing the joint angle. The skeletal muscle system plays a very important role in the human body. Basically the human body cannot survive without muscles.
Skeletal muscles generate movement in the body. Human beings are able to move from one place to other both dynamically and statically (Stone, 2003). One is able to move the hands, head, fingers, legs and the waist. This function is enabled through the skeletal muscle contraction and relaxation. When the skeletal muscle contracts or flexes the hand or leg folds. While when the muscle extends or relaxes the hand or leg unfolds. This is an illustration of the movement function of the skeletal muscles.
They support, hold, and protect major organs and tissues in the body. The skeleton structure of a vertebra provides the body frame in which organs and tissues support themselves on. Skeletal muscles connect and attach the organs and the body tissues on the skeleton (Stone, 2003). This provides a definite frame and shape of the body. They also protect special organs such as the eyes, the lungs, heart, and the stomach from harm. Abdominal muscles protect the vital organs around the abdomen while chest muscles protect vital organs around the bosom.
Maintain body posture and position. Through skeletal muscle tension the body is able to maintain a steady position and a posture based on what position the individual wishes to be in. They assist in standing, walking, sitting lying down, and leaning (Stone, 2003).
Ensure proper blood circulation around the body. Skeletal muscles found around blood vessels assist in blood circulation through contraction and relaxation. The rhythmic contraction and relaxation of skeletal muscles propel blood through the veins or arteries hence enhancing circulation. This function also ensures heat distribution throughout the body hence regulating body temperatures.
Assist in storage of proteins and energy in the body. Muscles are known to store excess protein found in the body hence this assists in energy providence during starvation. Animals that hibernate during various seasons store proteins in the skeletal system so as to sustain them throughout the hibernation period.
Skeletal muscles are affected by various diseases and in relation to them are bone diseases and fractures.
Myopathy is a skeletal muscle condition or disorder that is caused by prolonged disuse of a muscle do to several causes (Stone, 2003). The main cause though is usually as a result o a bone fracture. Bone fractures lead to no movement which leads to inflammation of the muscle leading to myopathy.
Another bone disease is Osteoporosis which means porous bones (Stone, 2003). This is a progressive bone disease that leads to decreased bone mass and density which causes week skeletal structure. The effects of this disease are that it alters level of protein present in the bone marrow as well as the skeletal muscles. Osteoporosis mainly leads to weak bone structure hence making the person vulnerable to bone fractures which can be caused by either car accidents, accidents while playing, or from falling.
Other bone diseases are rickets which are caused by lack of calcium and vitamin D in infants and children. This leads to weak bones and chronic states are signified by bent or knocked knees. Bone fractures are as result of force or stress on a bone in the body causing it to break or shatter. The bone can break completely or crack. Bone fractures are mainly caused by accidents or voluntary injury from another individual. An Osteologist categorizes bone fractures into the following categories: a simple fracture which is described as a bone broken into two pieces, an open fracture whereby the broken bone protrudes out of the skin, a closed fracture whereby the bone remains inside the body, and a stress fracture which is attributed to a crack in the bone due to overuse.
Bone fractures undergo the process of X-ray first which is performed by a radiologist. The X-Ray allows the doctor or Osteologist to identify which part of the bone is affected. The next step involves straightening or stabilizing the bone before casting it. After casting it the bone is left for weeks to allow it to heal. For bone diseases treatment usually includes medication, healthy dieting and physical therapy so as to strengthen the bones.
The skeletal muscle is a very essential part of the human body. Through body posture, positioning, blood circulation and movement man is able to function normally. To live a healthy and safe life prevents one from acquiring certain diseases or prevents bone fractures which may lead to physical impairment.
References
Stone, R. J & Stone, J. A. (2003).Atlas of skeletal muscles(4ed.). Boston: McGraw-Hill
Six Sigma Tools for Testing Statistical Significance
Six Sigma Tools For Testing Statistical Significance
Author
Institution
Introduction
Six Sigma technique has become exceedingly popular recently. This has resulted from the need for companies to achieve the highest quality in their products. In fact, quite a large number of organizations see Six Sigma as a measure of quality that aims at enhancing perfection in production. Six Sigma refers to a data-driven and disciplined methodology and approach that is used for doing away with or eradicating defects in every stage of production of services and products, as well as manufacturing and transactions. Six Sigma’s statistical representation gives a quantitative description as to the performance of a process. It is noteworthy that a process has to produce less than 3.4 defects for every million opportunities so as to attain Six Sigma(Paul 2004).
Six Sigma defects refer to anything that falls outside the specifications of the customer. In essence, a Six Sigma opportunity would refer to the total number of chances that a defect occurs. The Six Sigma Methodology has its fundamental objective as implementing a measurement-based strategy that concentrates on improvement of the process and reducing variations. This is done using two sub-methodologies of Six Sigma, which are DMADV and DMAIC. Six Sigma DMADV strategy, which stands for Define, Measure, Analyze, Design and Verify, refers to a system of improvement that is used to come up with new products or processes at quality levels of Six Sigma. In addition, it may be used in cases where the current processes need than an incremental improvement (Paul 2004).
Six Sigma DMAIC strategy, which is an acronym for Define, Measure, Analyze, Improve and Control, refers to a system of improvement for existing processes that are not in line with the specifications and, therefore, are seeking incremental improvement. The incorporation of Six Sigma strategies easily means an increase in the gross profit of a company as the defects are reduced and variations in production eliminated. In essence, it strives to fulfill the customers’ requirements in a profitable manner, or rather, to improve to the extent which such efforts improve the profits of the company. In manufacturing, the company will define the customers and their requirements, as well as how the manufacturing process should be improved. The performance of the fundamental business process that is involved will be measured and compared to the requirements of customers to determine the shortfall. The data collected will be analyzed, and causes of defects determined so as to come up with opportunities for improvement. An implementation plan is developed and deployed, while the improvements are controlled to ensure that the processes are on course (Stamatis 2003)
LG Six Sigma
LG started using Six Sigma methodologies in 1996. This was in an effort to correct defects in its production and safeguard its profitability in all branches. In 2002, it attained the 3.4 Six Sigma goal. In the Analysis phase of the DMAIC methodology, LG verifies the potential causes of defects through hypothesis testing.
Potential cause of defects in the products: malformed shipping labels
Defects present Defects absent Total
Root Cause present 140 0 140
Root Cause absent 29 101 130
Total 169 101 270
In this case, the hypothesis for the data presented above will take the following form.
H0: no relationship exists between malformed shipping labels and rejections by the packing scanner
H1: there exists a relationship between malformed labels and rejections by the packing scanner
With this data, the intermediate equation would be
Expected = (totals in the column x the totals of the rows)/ overall total
A Chi-Square test equation is used in testing the hypothesis. The equation is
χ2 = ∑3i=1= (Ai-Ei)/Ei
Where χ is the Chi value, A is the value of the data presented E is the expected value.
Suitability of the Chi-Square test
Chi-Square test refers to a statistical hypothesis test that incorporates chi-square distribution in instances where the null hypothesis holds true. It is mostly used in observing the results obtained through comparison of the given data with expected data. In essence, the Chi-test is carried out as proof that there exists no difference between the actual data and the expected data (Forrest 2003).
Underlining the suitability of the Chi-Square test are the two rules under which it operates. The Chi-Square would only be calculated using numerical values rather than ratios and percentages. In addition, it should never be calculated in cases where the expected value falls below 5 in any category (Stamatis 2003)
Chi-Square test, in this case, would be used to test whether two attributes are independent. In essence, it would determine whether the rejection of LG’s products has in any way been caused by the defective shipping label on the products. While the chi-square test assumes that the population from which the sample is derived is normal, it is noteworthy that the rule does not have to hold in the case of goodness of fit and testing for independence of variables. In addition, both tests only depend on the expected and observed frequencies, as well as degrees of freedom rather than any assumption pertaining to the parent population’s distribution (Forrest 2003).
Conclusion
Six sigma methodologies come in handy for many companies as far as safeguarding the quality of their products is concerned. Its incorporation aims at safeguarding the company’s profitability. In LG, Six Sigma was initially integrated in 1996 in an effort to curb defects. In finding out the connection between malformed labels and rejection by the scanner, a chi-square test would be used. This is because the test would not depend on the distribution of the parent population.
References
Forrest W. B, 1992. Statistical Methods for Testing, Development, and Manufacturing. New York: Wiley
Stamatis D. H, 2003. Statistics and probability. London: St. Lucie Press
Forrest W. B, 2003. Implementing Six Sigma: Smarter Solutions Using Statistical Methods. New York: John Wiley & Sons
Paul A. K, 2004. Six sigma demystified. New York: McGraw-Hill Professional
(Forrest 1992)
(Stamatis 2003)
(Forrest 2003)
(Paul 2004)
Six Concepts in Different Cultures
Six Concepts in Different Cultures
The world is full of different cultures. Every country and continent on earth has several different cultures with several different belief systems and values, and anthropology studies all these cultures throughout time. Aspects of anthropology like enculturation and ethnography I found particularly interesting because of possible impact they have. The process of enculturation is defined as the process by which a society’s culture is passed from one generation to the next. It is interesting that the lives and practices of grandchildren and great grandchildren are impacted so heavily by their grandparents and great grandparents. Ethnography is defined as the process where by an anthropologist goes to live among a different culture to study and record the practices of that culture. The amazing thing about ethnography is that the anthropologist has to live with and totally assimilate themselves to a new culture for an extended amount of time.
I found six concepts that were used in class presentations. Each of them is different in meaning, but are often found in the same culture. Rites of passage, acculturation, dowry, ranked society, adaptation, cultural relativism, and enculturation are the concepts that stuck out most to me. Cultural relativism is the thesis that one must suspend judgement on other people’s practices in order to understand them in their own cultural terms. Through listening to all of the class presentations, I learned that the United States is rich in diversity. I learned that culture is everywhere.
The first concept I chose is rites of passage. This concept was used in the marriage presentation. Rites of passage is defined as “rituals, often religious in nature, marking important stages in the lives of individuals, such as birth, marriage, and death” (Haviland, 490). The marriage group presented rites of passage in three forms, leave parent’s home, establish home, and establish a family. These three passages are main stays in American culture. When a person is married, the first thing that happens is that they move out of their parent’s house and move in with their spouse and establish a home of their own. The third passage is to establish a family with their new spouse.
The second concept is acculturation which is defined as “major culture changes that people are forced to make as consequence of intensive, firsthand contact between societies” (Haviland, 487). The concept of acculturation was most evident in the presentation made by the tourism group. I learned that when an American travels to another country they must abide by that country’s laws, adapt to their language, and the do’s and don’ts of life in that country.
I chose Dowry as the third concept of anthropology I learned about from listening to the Hindu Marriages group presentation. Dowry is defined as “payment of a woman’s inheritance at the time of her marriage, either to her or her husband” (Haviland, 488). I found it interesting that in the Hindu culture the brides family presents gifts to the grooms family as a symbol of thanks for allowing their son to marry the bride. This tradition is similar to the American tradition of the bride’s parents paying for the wedding.
After observing the presentation on pets I found the concept of Hierarchy to be the one concept that stuck out the most. Hierarchy is defined as “ an authoritative body or group of things or persons arranged in successive order; a ranked series of persons or things” (Webster’s dictionary, 170). I chose this concept after hearing one of the presenters talk about the way her three pets have formed a hierarchy amongst themselves. She talked about having a cat and two dogs. She said that the larger of the two dogs took on the role of alpha dog, which formed a hierarchy between the three pets.
The fifth concept I learned about was cultural relativism. I learned about this concept of anthropology from the music group. Cultural relativism is defined as “the thesis that one must suspend judgement on other people’s practices in order to understand them in their own cultural terms” (Haviland, 488). The music industry has several different genres ranging from country to bumping club music. The concept of cultural relativism is experienced by most Americans due to the fact that we enjoy several different types of music on a daily basis.
The sixth and final concept of anthropology I selected is enculturation. Enculturation is defined as “the process by which a society’s culture is passed from one generation to the next, and through which individuals become members of their society” (Haviland, 488). I chose this concept because it has had the most impact on me. The baseball group presented this concept by showing that the love of baseball has been passed down from generation to generation within American families. I learned how to play baseball from my father, and I will teach my children how the game is played.
Understanding others is a social skill that American society has developed since the civil rights era. Although, there is still racism and hatred in American society, we have gained knowledge through cultural relativism of how to accept other people for who they are. Through listening to the class presentations I have gained knowledge and understanding of other culture’s practices. The six groups that I thought practiced cultural relativism the most were the marriage, tourism, Hindu marriage, body art, music, and abortion groups.
The marriage group practiced cultural relativism by describing the traditional western marriage. In American society there are several different cultures that are intermarried. In order to have a successful intermarriage, the bride and groom must be fully accepting of each other’s culture. Take for example a marriage between an African American and an Anglo American. Both parties must be able to accept the culture that they bring into the household in order to truly assimilate themselves to each other. The Hindu marriage group described cultural relativism in a similar way. As with any marriage, the ability of the two families to accept each other is important, but with Hindu marriages sometimes they are arranged by the families. This form of marriage is interesting because the parents are in control of who their child marries, and then it up to the children to accept each other only after they are married.
The tourism group talked about international tourism. When I went to Mexico I had to follow the laws and language of that country. I recall one time when in a restaurant I tried to order some food and the waiter could not understand me, and I had to point to the menu. The way the group described cultural relativism was by sharing their own personal experiences about traveling to other countries and wanting to learn about the cultural practices of that country.
The body art group gave the best example of cultural relativism. The idea of “normal” is widely advertised on t.v. and print ads. Sharply dressed men and thin unblemished women are classified as the norm in our society. Rarely do you see a person with multiple piercings and body covering tattoos on billboards and commercials. I do not have any piercings or tattoos, but I now know that people who do have these use them as a form of self-expression. I am a believer in self-expression, but I choose to express myself in different ways. After listening to them talk about what they know, I have developed a larger tolerance for this type of art.
There are several radio stations in our city that play several different types of music on a daily basis. The music group gave the audience a few different types of music, which served as an example of cultural relativism. I think that music represents culture in that the musician tells a story about their experiences. After to listening to a rap song, I may be able to form an image of what it is like to live his life. I liked that there was a good mix of cultures within the group, which shows that they were able to put aside their own prejudices to present their topic.
The abortion debate has been a major source of debate since the early 70’s. The group that made a presentation on the abortion debate practiced cultural relativism by presenting arguments from both the pro-choice and the pro-life side of the issue. I recognized that each side was able to put aside their differences and listen to each other without incident. The group was probably made up of people who sided on both sides of the issue. I have a lot of respect for the people in that group because the abortion issue is a tough issue to talk about.
One thing I have noticed about the University of Houston in the three years I have been here is the cultural diversity that it has, and my anthropology class is no different. When the group presentation project was first talked about I thought there would be several people presenting about the same topic. I never would have imagined how many different topics were covered. The body art group showed me that all types of people have tattoos and piercings. As an Anglo-American I have never learned about arranged marriages. I find the practice to be strange, but I was eager to learn about it. I found it interesting that the children allow their parents to pick their spouse for the rest of their lives. The abortion debate group gave me information about the types of possible procedures available when a woman gets an abortion. I never realized that there so many different types of abortion procedures. I have never been a pet owner, and I don’t think I ever will, so it was in!
teresting to listen to what the pet group had to say. I found it particularly interesting that when there are more than two pets in a home a hierarchy is formed. I have always thought that the pets just live there and really don’t pay any attention to each other. The tourism group told me about the process of reciprocity. I have only been out of the United States once and I never encountered any person that wanted anything other than money for goods or services. I guess when I went to Mexico I missed all that type of interaction. I would have liked to see what I could get, that would have been interesting. The Hindu marriage group was interesting because they talked about the practice of dowry. As a male, I like the fact in the Hindu culture the bride’s family presents gifts to the groom’s family before the wedding.
In conclusion, the presentations have given me great insight to the multitude of cultures that the University of Houston enjoys. As an Anglo- American from suburban Houston, I have not been exposed to a great many of different cultures. I have learned to appreciate how cultures other than mine practice religion, familial relations, and political processes. Cultural anthropology as a class has taught me several things about culture and how it is recorded. The one thing I especially found interesting was the concept of ethnography. Moving into a totally different culture has to be difficult for both sides. I liked the article I read about the anthropologist who lived amongst prostitutes in New York and Atlanta. I wonder how the anthropologist was able to psychologically handle all the heart ache and abuse she witnessed. Anthropology is a very interesting field and I am looking forward to learning more about it.
Bibliography:
Haviland, William A. (1999). Cultural Anthropology: Third edition, University of Vermont. Harcourt College Publishers, 487-493.
