RESPIRATORY SYSTEM A complete‚ schematic view of the human respiratory system with their parts and functions. Latin: systema respiratorium The respiratory system (or ventilatory system) is a biological system consisting of specific organs and structures used for the process of respiration in an organism. The respiratory system is involved in the intake and exchange of oxygen and carbon dioxide between an organism and the environment. The primary function of the respiratory system is to
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The documentary "Super Size Me" is very interesting and thought-provoking. This film tells the story of a very healthy‚ middle-aged man named Morgan Spurlock who decided to find out how bad fast food actually is for the body. He guessed that the reason America is so obese is because of the amount of fast food that they consume. In order to see if this belief was correct‚ he decided that he would eat at McDonald’s three times a day for an entire month. He had to order supersized meals when asked‚
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development and its history in Russia 7 2.1 Reasons for underground economy appearance 7 2.2 Reasons for small enterprises to go underground 8 2.3 From Soviet underground economy to Russian 9 CHAPTER 3 Underground economy in modern Russia 12 3.1 Size of underground economy in modern Russia 12 3.2 Specific features of underground economy in Russia 13 CONCLUSION 17 ENDNOTES 18 BIBLIOGRAPHY 19 INTRODUCTION The attention of russian publicity today is mostly absorbed to the phenomenon
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Blood Components Normally‚ 7-8% of human body weight is from blood. In adults‚ this amounts to 4.5-6 quarts of blood. This essential fluid carries out the critical functions of transporting oxygen and nutrients to our cells and getting rid of carbon dioxide‚ ammonia‚ and other waste products. In addition‚ it plays a vital role in our immune system and in maintaining a relatively constant body temperature. Blood is a highly specialized tissue composed of more than 4‚000 different kinds of
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that animals or humans possess. In contrast to humans‚ no raven can compose music‚ no honeybee can speak in rhymes‚ and no manatee can solve equations with two unknowns. Only humans can perform such intellectual tasks because we have the ability to reflect back on our accumulated knowledge to help us achieve a goal or accomplish a task. It is natural to assume that our superior ability in several areas of mental function correlates to distinct characteristics of the human brain that are
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HUMAN ECOLOGY:ROLE OF FOOD AND WATER. What is Human Ecology? Ecology is the science of relationships between living organisms and their environment. Human ecology is about relationships between people and their environment. In human ecology the environment is perceived as an ecosystem (see Figure 1.1). An ecosystem is everything in a specified area - the air‚ soil‚ water‚ living organisms and physical structures‚ including everything built by humans. The living parts of an ecosystem - microorganisms
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Human Fertilisation and Development Each day cute little babies are born into this world and being dazzled by their beauty we forget all about the long complicating process that took place which made it possible to have a baby. Therefore in my essay I am going to discuss the human reproductive cell‚ fertilisation and the development of a human life. Humans reproduce sexually‚ with both parents contributing half of the genetic makeup of their offspring via sex cells or gametes. Gametes produced
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The eye is a rather small part of the body that makes up seventy percent of the humans total sensory ability. That is why we chose to describe the eye. Each part of the eye works together as a whole. Within and outside of the eye there are many working parts functioning around the clock.. The cornea is a very important part of the eye‚ but you can hardly see it because it’s made of clear tissue. Like glass‚ the cornea gives your eye a window in which to view the world. The a cornea is a
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the Human Body There are five major groups of compounds that compose the human body. They are carbohydrates‚ lipids‚ proteins‚ nucleotides‚ and water. These are all very important to humans and without them we would not be able to survive. They have many functions that encourage a human cell and a human body to function. Carbohydrates include sugars and starches‚ contain carbon‚ hydrogen‚ and oxygen which appears in a ratio of 1:2:1. Carbohydrates are classified according to size as monosaccharides
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This process begins at puberty. Spermatogonia cells are made by mitotic division of the primordial germ cell. Mitotic cell division produces diploid cells that are identical to the Parent cell with 46 chromosomes. The Spermatogonia increases in size and mass and becomes a spermatocyte which then divides by meiosis. Meiotic cell division results in four haploid cells each with 23 homologous chromosome pairs. Secondary spermatocytes are produced by the first meiotic division. The second meiotic
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