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Free research essays on topics related to: contraction

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  • Metabolic Muscular And Nervous Systems - 1,731 words
    The immediate source of energy for muscular contraction is the high-energy phosphate compound called adenosine triphosphate (ATP). Although ATP is not the only energy-carrying molecule in the cell, it is the most important one, and without sufficient amounts of ATP most cells die quickly. The three main parts of an ATP molecule are: an adenine portion, a ribose portion, and three phosphates linked together. The formation of ATP occurs by combining adenosine diphosphate (ADP) and inorganic phosphate (Pi). This formation requires a large amount of energy to and it is called a high-energy bond. In order for a muscle to contract, the enzyme ATPase breaks the ATP bond and releases energy which is ...
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  • Metabolic Muscular And Nervous Systems - 1,672 words
    ... ws the cross-bridge to detach and re-attach to another active site on an actin molecule. This contraction cycle is repeated as long as free calcium is available to bind the troponin and ATP is available to provide the energy. The signal to stop contraction is the absence of the nerve impulse at the neuromuscular junction. When this occurs, an energy requiring calcium pump located within the sarcoplasmic reticulum begins to move the calcium back into the sarcoplasmic reticulum. This removal of calcium from troponin causes tropomyosin to move back to cover the binding sites on the actin molecule and cross-bridge interaction ceases. It is possible for skeletal muscle to exert force without ...
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  • Dilation - 383 words
    Dilation has been used for millions of years. Even in the ancient times and still we use it until this day. An example of dilation used in ancient times is when ancient Egyptians built the pyramids. The pyramids were built in different sizes, but proportional. Now in this day and time we use dilation in many aspects. Dilation is used in both science and math. In science the microscope shows dilation, without microscopes many of the scientific discoveries wouldn't be possible! In math dilation mainly is used in Geometry to draw figure of different sizes in proportional sizes. In art dilation is used widely for, example architecture, paintings, and statues. In our everyday life we have many ex ...
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  • Sex Education In The Classroom - 1,755 words
    Contemporary Moral Problems T/TR 11:30-12:45 In today's society there is an on going debate over sex education and its influence on our children. "The question is no longer should sex education be taught, but rather how it should be taught" (DeCarlo). With teenage pregnancy rates higher than ever and the imminent threat of the contraction of STD's, such as HIV, the role of sex education in the school is of greater importance now then ever before. By denying children sex education you are in a sense sheltering them from the harsh realities they are bound to encounter. Sex education has become an essential part of the curriculum and by removing the information provided by this class we'll be v ...
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  • Sex Ed - 993 words
    There are many reasons why people argue for and against sex education being a set curriculum in our school systems, but not many people look at the facts of the issue before deciding that sex education is not right. The plain truth is that there has been a dramatic increase in the number of teenagers that have become sexually active. The age at which sexual intercourse first occurs is becoming younger. According to Stong and Devault, in 1996 17% of girls and 38% of boys admitted to having sex by the age of 15. These children that are having sex are doing it without proper knowledge of the risk they may be in. Without proper knowledge a person might go into the world thinking that as long as ...
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  • The Birth Of A New Worldan Epiphany - 702 words
    December 15th, 1989, I remember as if it were yesterday. The whole experience was so fast that I never had time to realize what was happening. I was twenty-three years old. I had been married for sixteen months. My wife and I had been together for a little over two years. Life with her was great. I never imagined it being any better. Boy was I wrong. In March of 89 my wife informed me that she was pregnant. I was in shock; I didnt know what to say. I was thrilled, excited, and shocked all at the same time. Just as soon as she told me the news, about a thousand questions rushed through my head. Am I too young to be a father? How will I handle the responsibility of taking care of a child? All ...
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  • The Return Of Doris Day - 511 words
    Throughout time, the struggle between good and evil has carried, in situations pertaining to both social and personal morality. Women have always seemed to be affected by this moral struggle. Throughout time women have have dealt with oppression and the ideals set for them to act a certain way in public situations. It seems that women have always been expected to maintain a good image in public. In past times women have been frowned apon for things such as drinking in public situations, but with the relatively recent upcoming of the womens feminist movement, many of these social standards have become archaic and socially obsolete. Like Ms. Loh discussed in her piece The Return of Doris Day, ...
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  • Laissez Faire - 1,062 words
    ... demand. With falling demand for output, business investment sank. High tariffs prevented an export-driven growth stimulus (2). (1) Flexible and falling prices, wages, and interest rates could offset an economic slowdown in several ways. In a business downturn, a decrease in labor demand and layoffs lead to a decrease in wages. Lower wages reduce the relative price of employing labor relative to capital and create an offsetting increase in the demand for labor. If prices fall further than wages, then purchasing power increases. Furthermore, with falling prices, the value of wealth holdings also increases - both effects contribute to increased consumption, offsetting the initial decrease ...
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  • Creatine For Athletic Performance - 1,074 words
    ... effect (Phillips 15)." 1.) "By volumizing your cells to hold more resources then normal(15)." 2.) "Create a drug like effect on cellular processes(15)." With this scenario, the dietary supplement can exert a positive effect on muscle metabolism and/or performance. The third theory and most important relating to my paper states that a supplement might help you build muscle, enhance athlete performance and improve your health by simply making up for the deficiency. This has basically been what most dieticians, nutritionists, doctors, etc. have viewed supplements as a means of protecting your body against vitamin and mineral deficiencies and so on. Supplements have been widely used for dec ...
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  • Asiatic Cholera - 2,579 words
    The disease known as Asiatic cholera first infiltrated Great Britain in 1831, with its arrival in Sunderland1. From there, it broke out in epidemic proportions through 1832. Three more epidemics would follow the 1832 outbreak, 1848, 1854, and 1866. Cholera is defined as an acute infectious disease, originated in India, characterized by profuse vomiting, cramps, etc.2 These epidemics killed numerous Brits and effected many more. Several reasons can be seen for the continued importation and spread during these different epidemics. Amongst the most prominent is dispute within the medical community. Until Robert Koch was credited with isolating Vibrio cholerae in 18833, the community was constan ...
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  • Prostitution Should Be Legal Misc - 1,115 words
    Referred to as the oldest profession, prostitution . . . has long been a problem which has provoked and disturbed Americans (Kinsie 3). Prostitution [is] the performance of sexual acts, solely for the purpose of material gain (James [NA]). Prostitution remains, excepted and considered normal in some cultures. No gender specifics exist for prostitutes , but female prostitutes comprise the majority of prostitutes. A person male and married characterizing the majority of prostitutes clients, commonly referred to as a John. Surprisingly, but true, US prostitutes work legally in some areas. Prostitution is currently illegal in all 50 states (Flowers 8), with the exception of 12 rural counties in ...
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  • Lls Of The Human Body - 2,164 words
    ... e detoxification processes by which enzymes act on chemicals and drugs to change their structure and reduce their toxicity. The smooth endoplasmic reticulum of skeletal muscle stores calcium ions that function in muscle contraction. The Golgi apparatus is composed of flattened membranous sacs, containing cisternae, that are stacked on each other like dinner plates. The Golgi apparatus modifies, packages, and distributes proteins and lipids manufactured by the rough and smooth endoplasmic reticula. Proteins produced at the ribosomes of the rough endoplasmic reticulum are surrounded by a vesicle, or little sac, that forms from the membrane of the endoplasmic reticulum. The vesicle moves to ...
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  • Aum Suprene Truth - 1,033 words
    On March 20, 1995 a nerve gas believed to be sarin was released in Tokyo. The gas was released in several commuter trains throughout the Tokyo metropolitan area, killing six, and injuring twelve hundred others. This act, described by local authorities as "a case of organized and indiscriminate murder, but one item in a string of crimes committed by the doomsday religious cult Aum Shinri Kyo (Aum Supreme Truth). At about 8:15 A.M. Tokyo time, packages left on several commuter trains throughout Tokyo released a deadly nerve gas. The subway stations initially cited to be affected were Tsukiji, Kasumigaseki, Kamiacho, Kokkai-gijidomae, Hibia, Hacchobori, Kodenmacho, Nakano-Sakaue, Akasakamitsuke ...
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  • Anatomy - 2,889 words
    ... ssue Connective tissues have three main elements: ground substance, fibers, & cells. Ground substances make up the extracellular matrix. (Note: that the term matrix indicates the ground substance.) Ground Substance - is an amorphous (unstructured) material that fills the space between the cells & contains the fibers. It is composed of instertitial fluid, cell adhesion proteins, & proteoglycans. Cell adhesion proteins, a group that includes fibronectin & lamina, sever mainly as a connective tissue glue that allows connective tissue cells to attach themselves to matrix elements. The proteoglycans consists of a protein core to which glycosaminoglycans (GAGs) are attracted. The strand-like G ...
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  • Volcanoes - 678 words
    EXPLORATION AND DISSECTION OF A MAMMALIAN HEART In this experiment, we obtained a fresh heart and dissected it to examine and observe the different parts of the heart, as well as studying how they function and work Problem: How can we study the heart through dissection? The most basic function of the circulatory system is to move the blood. The organ that provides the force to push the blood through the vessels is the heart. The mammalian heart is composed of four chambers to which large blood vessels are connected. The walls of these chambers are made of cardiac muscle tissue. It is the contraction of these muscular walls in a synchronized manner that moves the blood through this pump and i ...
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  • The Sign Of The Four - 829 words
    St. Louis Cardinals Mark Mcgwire and the Chicago Cubs Sammy Sosa stated: Creatine gives us more strength in our workouts, and has helped us produce a more powerful homerun swing. (Williams 1) Creatine is an all-natural nutrient found in the bodies of all humans and most animals. 95% of the bodys Creatine supply is found in the skeletal muscles. The other 5% is spread throughout the body. People take this substance because it will increase your muscle mass and make you stronger by an intense workout. The short-term effects of Creatine are good, but the long-term effects still remain in doubt. Creatine becomes very complicated when you talk about what it does to the body and how it works. It i ...
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  • Creatine - 1,338 words
    Creatine is not an Herb, mineral, vitamin, hormone, or a steroid. It is also not those bread cubes that you scatter over your salad, either. Creatine is a natural nutrient found in our bodies and the bodies of most animals. Approximately ninety five percent is scattered throughout the rest of the body, with the highest concentrations in the heart, brain and testes. The human body gets most of the creatine it needs from the food or dietary supplements. Creatine is easily absorbed from the intestinal tract into the bloodstream. When dietary consumption's is inadequate to meet the body's needs, a limited supply can be synthesized from the amino acids arginine, glycine and methionine. This creat ...
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  • Black Hole - 1,868 words
    An image of the core of the Whirlpool galaxy M51 taken by the Wide Field Planetary Camera onboard the Hubble Space Telescope. It shows an immense ring of dust and gas which is thought to surround and hide a giant black hole, 1 million times the mass of the Sun, in the center of the galaxy. The ring forms an accretion disc of gas, about 100 light years across, falling toward the black hole. The two brighter areas perpendicular to the widest dark lane are two jets of particles accelerated by the black hole. Anyone who has ever watched the launch of a rocket is familiar with the concept that escape from a gravitational field requires the expenditure of energy. The stronger the gravitational fie ...
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  • Japans Econimic Policy - 1,111 words
    The Current Economy and Medium-Term Growth Prospects Summer 1999 brought several indications that the recovery is slowly starting to gather momentum. Public investment, the zero interest rate policy, and an easy lending stance backed by government credit guarantees has clearly had an effect. Full-scale private sector restructuring has also helped put corporate profits back on an uptrend and this is having a major macroeconomic impact. The authorities have recognized that the rejuvenation of industry at the microeconomic level is necessary for revitalization at the macroeconomic level, which has led them to combine traditional demand stimulus policies with efforts to make business more compet ...
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  • Propofol Vs Thiopental - 2,452 words
    Neuromuscular blocking agents are an essential aspect of attaining adequate muscle relaxation in patients prior to attempting endotracheal intubation. Succinylcholine is one these agents used, most commonly when attempting a rapid sequence induction. Succinylcholine administration is associated with muscle fasciculations and subsequent myalgias postoperatively. A nondepolarizing neuromuscular agent is commonly administered to reduce the occurance of fasciculations and myalgias. Additionally, the induction agent Propofol, has been associated with further reducing fasciculations and myalgias. Propofol and Pentothol are commonly used anesthetic agents and are generally interchangable and equall ...
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