Investigating The Structure Of Pig Heart Physical Education Essay

Investigating The Structure Of Pig Heart Physical Education Essay Introduction There are three layers of the heart: the epicardium, myocardium and the endocardium. The heart, like a dual pump, which is to pump blood around the whole body, pick-up nutrients and oxygen, at the same time, helping eliminate deleterious wastes, such as carbon dioxide. Moreover, the heart consists of four chambers: two ventricles and two atria. The upper chambers are called atria while the lower chambers are called ventricles, they are separated by valves. Valves are one-way, see Figure 1(Lane, 2010b), hence, they play an important role in preventing the blood from flowing back. Figure 1 One Way Valve (Lane, 2010b) The left are right chambers are separated by muscular wall septum. Without this septum, blood from one chamber will be mixed up with the blood from another and be contaminated (Burnell, 2010). The ventricles have thicker muscles than the atria, they are strong enough to pump the blood out of the heart and circulate to other parts of the body.   Besides, the pressure applied on the left ventricle is greater. As a result, the walls of the left ventricle are the thickest among all the walls of chambers (Burnell, 2010). The coronary artery supply blood to heart muscles and oxygenated, it under the groove on the front the heart and it branches over the front (Lane, 2010b) The pulmonary artery can carry blood to lungs to incept oxygen. It is used to travel the short distance to lungs because large volume of blood can be passed through and oxygenated. The pulmonary artery locates d of curving out of the right ventricle (Lane, 2010b). Methodology Apparatus The material and apparatus used in the experiment: the fresh pig heart, dissecting pan, forceps, scalpels, scissors and gloves. Methods and Observations Procedure 1: External Structure (Lane, 2010a) The heart was washed and placed into a dissecting pan. The colour of heart is pink, white colour exist in the top (maybe this colour is from fatty) and with much dried blood. It can be held by two hands and approximately is 13 cm 10 cm 7 cm. The heart is about 0.25 kg. The pericardium was found a covering the membrane of heart. The pericardium was cut by a scalpel so that the pericardium could be observed. The myocardium was located below the pericardium. The pericardium is a strong membrane. Thus, it is difficult to remove this membrane. It is about 1mm and colourless. The apex was located and was pointing down. The apex is easy to find, it is pink and pointed. The front of the heart was recognized by a groove that extends from the right side of the broad end to the left of the apex. There are many veined patterns in the front of heart, judged it in this way: the major blood vessels were on the top half running down to the apex. There were four chambers in heart. The left and right atria were found. Left and right chambers are distinct and atria are upper than the ventricles. Also, the left chambers are bigger than right chamber. Blood vessels at the broad end of the heart were located. The coronary artery was found its position; the pulmonary artery was located by finger curving out of the right ventricle; and the aorta was located behind the pulmonary artery. The pulmonary veins were found at the top of the left atrium. The superior vena cava was found in top of right atrium. The coronary artery is under the groove on the front of the heart. The pulmonary artery on the right side, the aorta is behind the pulmonary artery both from the top. The diameters of holes are about 3cm. The pulmonary vein is in the left side and behind the superior vena cave. However, the inferior vena cava can not be found. Figure 2 and Figure 3 are shown the external structure (Xia, 2010). Procedure 2: Internal Anatomy (Lane, 2010a) Using scissors, the pulmonary artery was cut through. The wall of the right ventricle was cut down continually, parallel to the groove of coronary artery. It is easy to cut through and the wall of the right ventricle. The wall is about 1cm thin and very smooth. A finger was used to push open the heart, the dried blood inside the chambers was washed out. Many blood clots exist inside. The blood clots are dark and jellified. The muscular wall of right atrium was measured. The right ventricle was felt the thickness and its smooth textured lining. The muscular wall of the right atrium was measured, about 1cm. The wall is very smooth. Inferior vena cava was found in the internal right ventricle, and the lack of valves was noticed. Inferior vena cava in the inside chamber lower left, which locate in right ventricle, near apex. The valve between the right atrium and right ventricle was observed. The valve between the right atrium and right ventricle is thin and easy to break. It was not easily seen. The network of irregular muscular cords was noticed. The network of irregular muscular cords was found everywhere. The colour of them is pink and ropy. It is hard to destroy. The septum on the right side of the right ventricle was found. The septum on the right side of right ventricle is very thick about 1.5cm. Using a finger, the pulmonary artery was followed to locate the right ventricle. The pulmonary valve was found. The pulmonary valve is very thin about 1mm and not seen to be intact. Figure 3 is shown the right side of heart (Xia, 2010). Using scissors, the heart was cut on the outside of left atrium downward into the left ventricle cutting toward the apex to septum at the center groove. The heart was cleaned. The wall of the left atrium is about 2.5cm. The wall of the left ventricle is thicker, about 3 cm and hard to cut through. Jellified bloods were washed. Semi-lunar valves were found. Semi-lunar valves are consisting two valves, about 1mm and pink. Mitral valve was found. The two parts of valves were seen and about 1mm. The left ventricle was cut across toward the aorta, to expose any valves. The left ventricle is hard to cut because the wall is about 3cm. The aortic valve was found. The valve is consisted of three flaps, the shape as half-moon, about 1mm. Figure 5 is shown the left side of heart (Xia, 2010). Figure 6 is shown the internal anatomy (Xia, 2010) Result Figure 2 The Front View of Heart (Xia, 2010) Figure 3 The Rear View of Heart (Xia, 2010) Figure 4 The Right Side of Heart (Xia, 2010) Figure 5 The Left Side of Heart (Xia, 2010) Figure 6 The Internal Structure (Xia, 2010) All these figures are at the end of report in the appendix. Discussion Initially, because the structure of heart is unfamiliar, the process was done slowly, and many aspects are uncertain. In addition, before the experiment a picture of heart structure was found, during the experiment the picture was used to compare with the real heart so that identification can be more easily achieved to find structures position. However, the correct position of picture is different from position in the real heart. The reasons may the diagram is idealized, the real heart is empty and collapsed, structures lack colour contrast to distinguish. When the wall of left ventricle was cut, it is more difficult to sever than the right ventricle. During procedure 2, some muscular cords were cut and some places were undistinguishable. The wall of left ventricle is much thicker than right wall because the left ventricle did the major work. The handout suggested that watching the diastole and systole of the heart. However, this is a departed pig heart, thus, the phenomenon can not be seen. In addition, valves are very thin, when the heart is cut, valves are easily destroyed by mistake, such as the pulmonary valve is not seen to be intact. Conclusion During the experiment, the heart was examined, its external structure, each vessels characteristic and position was found and recognized. In the internal anatomy, different positions of valves were found. Dimensions of different parts of heart were measured: the size of heart, the pericardium, the diameter of vessels holes, the wall of the right ventricle and atrium, the wall of the left ventricle and atrium, the thickness of semi-lunar valves, the thickness of mitral valve, the thickness of aortic valve.

An argument in favor of abortion supporting a womans right to freedom Essay

Is there ever a case, when one person’s religious preference should be allowed to encroach on another person’s right to life, liberty and the pursuit of happiness? Today many American’s justify their intrusion by siting Articles and Amendments to the Constitution of the United States.   In particular, they speak of the freedom of speech, religion, the right to bear arms, etc.   It seems as though the freedoms are only valuable when everyone shares the same beliefs, morals, and values.   But are these freedoms also guaranteed for those whose values may not be the same as the majority?   As American’s is it not possible to differ and hold different beliefs in pursuit of liberty?   What makes one person’s beliefs more valuable under the constitution than another person? A lot of people do not support abortion because they believe it is killing baby. When most abortions occur, which in the first trimester â€Å"†¦a cluster of cells or a less than half ounce fetus is not anywhere close to a definition of an actual baby.† (4) Scientists use the term fetus and not a baby because a baby â€Å"†¦could be born and survive outside the mother’s womb†¦Ã¢â‚¬ (4) and a fetus could not. A fetus is nowhere near ready to live outside the mother’s womb and â€Å" There is no real functioning brain, therefore no real humanity.† (4) So in reality abortions do not terminate babies, they terminate a fetus that could not survive outside the mother’s womb. Another reason people are not for abortion is that of religious beliefs. Some believe that terminating any form of life in the mother’s womb is wrong no matter the reason and â€Å"Those religiously opposed to abortion in the first two trimesters are free not to have them.†(9) Just because abortion is legal does not mean people are going to be forced to go out and participate in them. Abortion being legal does not impose on anyone’s rights or make anyone do anything they do not want to do. Therefore, if abortion goes against someone’s religious beliefs they are free not to go and get one. People who do not want abortion legalized talk about how it goes against their religion but what about the religion of the woman partaking in the abortion? Not everyone has the same beliefs or sees things the same as others. By trying to make abortion illegal it infringes on citizens rights. If â€Å"†¦my brothers and sisters in the United Church of Christ, who do not see the bible they way you see it, are free to make their own choices†¦ isn’t that freedom of religion too?† (9) People cannot talk about how abortion imposes on the pro-choices religion without talking about the religious freedom of the woman undergoing the procedure. If a woman’s beliefs tell her to do what is best for her The last topic is how making abortion illegal will take away a woman’s right by forcing her to stay pregnant. There are various reasons why a woman chooses to have an abortion. Whether it is because the woman is not ready for kids emotionally or financially, the baby was produced by rape or incest, or she simply just may not want kids and etc.   For people who are pro-choice â€Å"†¦ If your side ever wins, then my daughter and her daughter will be forced to stay pregnant, when their life circumstances†¦ would be much better served if they could safely terminate the fetus†¦Ã¢â‚¬ (7) So for people out there who are wanting abortion to illegal, in a sense, they want a woman to be forced to be pregnant even if that is not what is best for the woman. If abortion stays legal â€Å" we haven’t forced your daughter or her daughter after her, to do anything against their will.† (7) By keeping abortion legal no one’s rights will be infringed on a nd no one is forced to do anything they do not want to do. The same cannot be said if abortion was made illegal. In conclusion, abortions do not terminate babies it terminates fetuses. If abortion goes against someone’s religious beliefs they are free not to have them but do not forget about the religious freedom of the woman undergoing the abortion. People who do not support abortion will never be forced to do something against their will whether its legal or illegal but making abortion illegal will force a woman to stay pregnant against their will. These were just a few reasons why I think abortion should stay legal.   

Single Gender Schools - 632 Words

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Analysis Of The Book Hot Nigga Essay - 1590 Words

â€Å"About a week ago!† my cousins screamed in unison with enthusiasm. I peeked over my current book, The Secret, and stared at them, partly puzzled, partly annoyed. â€Å"What’s that about?† I enquired after hearing the phrase for the fourth time that day. After finding amusement in my lack of awareness of the phrase and its origin, my cousins took pity on me and explained. They played the hip hop song â€Å"Hot Nigga,’ then proceeded to show me the weird dance move that accompanied it, called the â€Å"Shmoney Dance,† where they bent one leg at a time, in sync with lowered arms and their fists clenched. â€Å"But why?† I had asked. My cousins then told me of the popularity of the phrase, and its overall â€Å"coolness.† They played the song for me and as I paid attention to the lyrics, I noted its constant mention of violence and I wondered if they did as well. While I initially found the lyrics of the song â€Å"Hot Nigga† disturbing, very quickly I realized that although my cousins proclaimed their love for this â€Å"cool† song and repeated the phrase â€Å"About a week ago† with reckless abandonment, they seemed to lack awareness of the rest of the lyrics. This became evident when I asked them to sing it, and the only coherent words they could repeat were those of the phrase â€Å"About a week ago.† Little do they know that Bobby Shmurda, whose real name is Ackquille Pollard, in an interview claimed that the song â€Å"Hot Nigga† was based on his life story. He later retracted this statement when referencing the phraseShow MoreRelated The Perception of African Americans in the Media and How it Affects Their Self-Identity3877 Words   |  16 PagesMuwakkil makes a very strong point when he cites the Kerner Commission’s findings: Whats more, the Kerner Commission (formally known as the National Advisory Commission on Civil Disorders), which was charged with finding the reasons for the long-hot-summer rebellions, had concluded that the United States was headed dangerously toward two societies, one black, one white, separate and unequal. It blamed the urban unrest on persistent racial discrimination and a historical legacy of disadvantageRead MoreAmerican Slang Essay 115481 Words   |  62 Pages1970, the scholarly collection and analysis of American college slang was at best sporadic. However, in these scattered treatments can be seen traces of the major changes that transformed college slang and college culture by the 1970s. By 1926-27, slang at Kansas University depicted not only â€Å"loose women† but also women students as having sex appeal, with terms like hot-sketch, and mean-baby. University of Missouri slang of 1931 called a â€Å"chic, up-to-date coed† a hot number and â€Å"one who ne cks on a date†