Heart and Cardiac Muscle Essay Example for Free

Heart and Cardiac Muscle Essay What is the heart? The heart is the organ that supplies blood and oxygen to all parts of the body. It is about the size of a clenched fist, weighs about 10.5 ounces and is shaped like a cone. The heart is located in the chest cavity just posterior to the breastbone, between the lungs and superior to the diaphragm. The heart is surrounded by a fluid filled sac called the pericardium. Blood is pumped away from the heart through arteries and returns to the heart through veins. The major artery of the body is the aorta and the major veins of the body are the vena cavae. Chambers of the Heart The heart is divided by a partition or septum into two halves. The halves are in turn divided into chambers. The upper two chambers of the heart are called atria and the lower two chambers are calledventricles. The atria receive blood returning to the heart from the body and the ventricles pump blood from the heart to the body. Valves allow blood to flow in one direction between the chambers of the heart. The Heart Wall The heart is composed of cardiac muscle which enable the heart to contract and allow the synchronization of the heart beat. The heart wall is divided into three layers: the epicardium, myocardium, and endocardium. * Epicardium outer protective layer of the heart. * Myocardium muscular middle layer wall of the heart. * Endocardium inner layer of the heart that is continuous with the inner lining of blood * Cardiac Conduction * Cardiac conduction is the rate at which the heart conducts electrical impulses. Cardiac muscle cells contract spontaneously and are coordinated by nodal tissue, specifically the sinoatrial node. There are other factors that influence heart rate as well. These include endocrine hormones, body temperature and exercise. * Cardiac Cycle * The cardiac cycle is the sequence of events that occur when the heart beats. There are two phases of this cycle which are the diastole and systole phases. During the diastole phase, the atria and ventricles are relaxed and blood flows into the atria and ventricles. In the systole phase, the ventricles contract sending blood to the rest of the body. A heartbeat is a two-part pumping action that takes about a second. As bloodcollects in the upper chambers (the right and left atria), the hearts natural pacemaker (the SA node) sends out an electrical signal that causes the atria to contract. This contraction pushes blood through the tricuspid and mitral valves into the resting lower chambers (the right and left ventricles). This part of the two-part pumping phase (the longer of the two) is called diastole. The second part of the pumping phase begins when the ventricles are full of blood. The electrical signals from the SA node travel along a pathway of cells to the ventricles, causing them to contract. This is called systole. As the tricuspid and mitral valves shut tight to prevent a back flow of blood, the pulmonary and aortic valves are pushed open. While blood is pushed from the right ventricle into the lungs to pick up oxygen, oxygen-rich blood flows from the left ventricle to the heart and other parts of the body. After blood moves into the pulmonary artery and the aorta, the ventricles relax, and the pulmonary and aortic valves close. The lower pressure in the ventricles causes the tricuspid and mitral valves to open, and the cycle begins again. This series of contractions is repeated over and over again, increasing during times of exertion and decreasing while you are at rest. The heart normally beats about 60 to 80 times a minute when you are at rest, but this can vary. As you get older, your resting heart rate rises. Also, it is usually lower in people who are physically fit. Your heart does not work alone, though. Your brain tracks the conditions around you—climate, stress, and level of physical activity—and adjusts your cardiovascular system to meet those needs. The human heart is a muscle designed to remain strong and reliable for a hundred years or longer. By reducing your risk factors for cardiovascular disease, you may help your heart stay healthy longer.

EXTRA CREDIT HOMEWORK ON THE NATIONAL DEBT :: Essays Papers

EXTRA CREDIT HOMEWORK ON THE NATIONAL DEBT First, I would like to bring to your attention that I did forget to copy the URL because I could not get back to where I wanted. I did use the general topic National Debt, Time Magazine and Time Daily. I did get part of the URL http://pathfinder.com that is all. I am not good with computers and trying for hours just to get the web created much frustration. I hope you will still consider my work. The national debt at the minute is $4,987,184,610,949.10 and increasing $616 million every day. I do not think that the debt will ever decrease but will continue to increase. I think it is in nice terms that the government is trying to do something about it. They are creating difficulties in the process. They are going to agree. As of today, November 14, 1995, the government has shut down. The national parks, nonessential federal agencies are closed. Layoffs consist of 800,000 federal workers. No one will get paid that works for the government until they agree. These particular draw backscreate the question as to if the budget is worth it. Along with the layoffs and businesses closing, thetaxpayers paying $1.2 million dollars for every day that the goverment is closed. They should just raise the taxes if this is going to occur for awhile. The biggest problems occuring are increasing Medicare premimums, agreeing on a budget plan, and the tax cut. Clinton says he can do it in nine years, congress wants it done in seven. They already know, pretty confident that Clinton will veto the plan again. The tax cut is wanted to be at $245 million constant over a seven year period. Also, a $500 -a- child tax

Footnote to Youth Reaction Paper Essay

â€Å"The youth is the hope of motherland.† It has always been said that we, the youth, is the hope of our country. This has been the mentality of almost everybody in the society. I, myself had this mentality strongly rooted in my mind before I had read the story, â€Å"Footnote to Youth.† Yes, the youth could possibly be the hope of our country or even of the world. As many have said, we are creative, dynamic, good thinkers, marvelous doers and a lot more. All these positive things also have corresponding negative thoughts from those who don’t believe in our capacity. They say we are lazy, dependent, coward, apathetic and a lot more. I think it is neither laziness nor dependence that drives us youth into somebody useless in the society. We never wanted to become just a piece of crap of course. We always have wanted to do something extraordinary not just for ourselves’ sake. We have always wanted to be something the older and younger generation would be proud of. For me, the dilemma is not within us. It is on how our parents and the people around us treat us and affects us. I admit our minds are not as weak as the minds of the little children. We cannot be easily manipulated. But we’re not also as fixed-minded as the older people. We need guidance. How can we be the hope of the country if our parents themselves don’t lead us to the right path? How can we be the hope if our parents themselves don’t believe that there is real hope from within us? How can we be the hope if our parents themselves cannot correct the mistakes we do? Just like Dodong and Blas, we are preoccupied of the thinking that we can do everything we want to; that we are ready to do the things that the older people can; that what we think is always right. Yes we can do everything if we really insist to but without the guidance of our parents or the older people who know better, we will never know if we are making the right steps toward the right road. They hold the key that runs the engine of hope within the youth. I still believe that we, the youth, is the hope of the motherland but this will just come to reality if the older generatio n, especially our parents know how to bring out the best in us. -Jogie Rodriguez Torres, BST- IV June 25, 2013

Essay about Professional Dress Code in the Workplace

Professional Dress Code in the Workplace Rosaura P Bernal EN 306 – Nadia H Morales Park University The first impression is a lasting impression whether it is at the office, a party, a lunch date or an interview. What you wear to these events can be either a positive impression or a negative one. That is why I think it is very necessary to have a professional dress code in the workplace if your place of employment is that of a professional setting such as a bank or even an insurance company. If the professionalism does not show on what the employees are wearing, how are their customers going to accept that they are professionals at what they do. The business could lose the credibility of how they handle their business. Nowadays,†¦show more content†¦The way an employee dresses up for work can impact on how a person perceives that employee. It can hold a positive or negative impact depending on where they work. You don’t expect to find a personal banker dressed in skinny jeans, a bright pink polo shirt, and tennis shoes. You expect for them to be wearing a s uit with a tie, polished shoes and be nicely groomed. By dressing in this fashion, you can see that the employee is committed to his job and place of employment and that they are responsible. By dressing otherwise, they would seem irresponsible and need their parent to dress them up. It also shows how they manage their time wisely. They took their time to iron their clothes and got them ready for the day. If not, they would look like they just crawled out of bed and had no time to get themselves ready. It also reflects on their organizational skills because they are able to tailor the look together and they get it ready for the start of their business day, which can also show how competent they are in getting themselves ready. The competence doesn’t stop there, it can also affect on how people see how competent they are at doing their job. If they are not capable of getting themselves dressed appropriately, how efficient are they at doing their job? It can also lead t o how serious they take their job. If they don’t care for how they dress to work, how serious areShow MoreRelatedDress Code And Dress Codes1565 Words   |  7 Pagescomes to dress code, every individual has a different viewpoint for its implementation. There are clothes that could be fashionable to one person but seen as offensive to another. A dress code can be justifiable when put into a situation that really does require certain attire to be worn. It gives a sense of formality and distinguishes an individual apart from a group. This report seeks to compare and contrast the characteristics of school dress codes with that of dress codes in the workplace. 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