The cells of the adaptive immune system are special types of leukocytes‚ called lymphocytes. There are two main types of lymphocytes‚ B cells and T cells‚ which are derived from hematopoietic stem cells in the bone marrow. T cells are involved in cell-mediated immune response‚ whereas B cells are involved in the humoral immune response. The surface of each lymphatic cell has receptors that enable them to recognize foreign substances. There are two major subtypes of T cells: the helper T cell and
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Site Plan | I. Neurons/nerve cells A neuron is a cell specialized to conduct electrochemical impulses called nerve impulses or action potentials. Neuron is the main cellular component of the nervous system‚ a specialized type of cell that integrates electrochemical activity of the other neurons that are connected to it and that propagates that integrated activity to other neurons. They are the basic information processing structures in the CNS.
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which he called cells’ this in itself unbeknownst to him‚ was the discovery of the fundamental unit of all living things. In 1838 a botanist called Schleiden derived the theory The basic unit of structure and function of all living organisms is the cell.’ Over 150 years later this can be regarded as one of the most familiar and important facts within the biological fields. Drawing of cork cells published by Robert Hooke 1665 The Cell itself and use
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Students can: a. Present information‚ findings‚ and supporting evidence‚ conveying a clear and distinct perspective‚ such that listeners can follow the line of reasoning‚ alternative or opposing perspectives are addressed‚ and the organization‚ development‚ substance‚ and style are appropriate to purpose‚ audience‚ and a range of formal and informal tasks. (CCSS: SL.11-12.4) b. Make strategic use of digital media (e.g.‚ textual‚ graphical‚ audio‚ visual‚ and interactive elements) in presentations
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Cell Phone and Social Graces Have you ever talk to someone and they did not reply because they are busy playing on their cell phone? We all have that experience. We cannot blame on the cell phone because people are responsible for their behavior. In the essay “ Cell phone and social graces”‚ Charles Fisher elaborates on the use of cell phone and shows how careless‚ sometimes inconsiderate‚ and needy most people are when using their cell phones. Charles Fisher pointed out the negative when people
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K 10/28/11 Norton Commonly thought of as belligerently walking the streets late at night‚ or at any time in fact‚ the Irish culture is inaccurately perceived as the drinking type‚ at any point of the day on any day of the week‚ though usually all of the above. Americans drink‚ French people do too‚ as well as our friends from Great Britain‚ but for some reason people always accuse those Irish people of being too drunk too often. It just so happens to be that I am Irish‚ and American‚ though
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When I was twelve‚ my maternal grandfather died of prostate cancer. My parents had hid his sickness from me for months‚ thinking I was too young to handle the news. I found out only weeks before he died‚ and I recall being furious with my parents at his funeral. So‚ I asked my grandmother if I could stay with her for a while‚ thinking I could keep her company and also get a break from my parents who I felt had somehow betrayed me. Within weeks of moving in with my grandmother‚ she told me she had
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IRON ORE DRY BULK TRADE Demand for dry bulk commodities like iron ore is driven by industrial production and growth requirements. An increase in steel production stimulates the growth of iron ore shipments and also the trade. From early 2000s‚ the iron ore market began a transformation following China’s increasing demand for steel. World production of iron ore exceeded 1 billion tonnes in 2002. International iron ore trade reached record levels at 512 million tonnes (Mt). Price negotiations
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The cell cycle‚ or cell-division cycle‚ is the series of events that take place in a cell leading to its division and duplication that produces two daughter cells. In cells without a nucleus‚ the cell cycle occurs via a process termed binary fission. In cells with a nucleus‚ the cell cycle can be divided in three periods: interphase—during which the cell grows‚ accumulating nutrients needed for mitosis preparing it for cell division and duplicating its DNA—and the mitotic phase‚ during which the
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Cell Structure and Function Chapter Outline Cell theory Properties common to all cells Cell size and shape – why are cells so small? Prokaryotic cells Eukaryotic cells Organelles and structure in all eukaryotic cell Organelles in plant cells but not animal Cell junctions History of Cell Theory mid 1600s – Anton van Leeuwenhoek Improved microscope‚ observed many living cells mid 1600s – Robert Hooke Observed many cells including cork cells 1850 – Rudolf Virchow
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