Cells must move materials through membranes and throughout cytoplasm in order to maintain homoeostasis. The movement is regulated because cellular membranes‚ including the plasma and organelle membranes‚ are selectively permeable[1]. The purpose of an automatic flow of molecules is to create equilibrium on each side of the membrane. In order for molecules to pass through the membranes‚ there must be pores. The size of the pore determines what molecules can cross. Due to the size and polarity‚ only
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The Bloods and the Crips The United States has had problems with gangs dated back as early as the 1800s. In today’s society when people hear about gangs the first two gangs that they think of are the Bloods and the Crips. Both of these gangs originated about forty years ago but are still going strong today. Although‚ at first these gangs were formed as a sort of territorial war the activities of the gang members has grown increasingly more dangerous. The Bloods and the Crips are mortal enemies
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Stem Cells and Tissue Renewal 1 The Multicellular “Habitat” • Cells of multicellular organisms – highly specialized – over 200 types in human body • Arranged into tissues‚ organs‚ organ systems • Unable to survive outside body “habitat” skin wont survive in heart tissues. They all start up identicals 2 Specialized Cell Types • Cells of early embryo identical • Differentiation results in specialized cell types – some differentiated cells continue to divide – many others are
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circulatory systems work together to distribute oxygen to‚ and remove carbon dioxide from the cells of the body. The circulatory system and the respiratory system work closely together to ensure that organ tissues receive enough oxygen. Oxygen is required for cellular functions. The air breathed in and held in the lungs is transferred to the blood. The blood is circulated by the heart‚ which pumps the oxygenated blood from the lungs to the body. Additionally‚ the two body systems work together to remove
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Donating Blood as Stated by the American Red Cross It is said that 70% of Americans are eligible to give blood even though the criteria to donate seems quite strict. Each case is treated individually based on why the person is donating. An autologous donor is one who is giving blood to use for them self if needed during a future surgery. All others are anonymous donors who donate blood for others to use when it is needed. I will discuss the reasons why a person could not donate blood as an anonymous
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Part A: Title: Diffusion Diffusion is the spontaneous movement of particles from where they are more concentrated to where they are less concentrated. For this experiment‚ a 14 cm glass was filled with cold tap water. A drop of red food coloring was dropped in the cup. A stopwatch was used to measure the time it took for the food coloring to get to the bottom of the cup. The average diffusion rate was .78 cm a second. If a different color was used‚ I do not think it would have made a difference
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Blood Brother Performance Essay On the 14TH June 2012‚ we watched Blood Brothers‚ by Willy Russell‚ at the Phoenix Theatre. The play ‘Blood Brothers’ is set in 1980s Britain; it deals with numerous themes such as fate‚ the class system‚ insanity‚ superstition and division. The genres of the play are drama‚ tragedy & comedy-to an extent. Something I found particularly interesting was how the genre of comedy became less and less apparent as the play went on‚ whereas the genre of tragedy- became
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Movement in and out of cells Diffusion: (mixing molecules) Molecules and ions in a liquid or a gas move continuously. The movement is quite random‚ and the particles change direction as they bump into one another. The particles collide more often when they are close together (when they are concentrated) and so they tend to diffuse‚ or spread out‚ until they are spaced evenly throughout the gas or liquid. The random movement of particles is due to their own kinetic energy. When the diffusion
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maintaining vascular tone‚ blood flow‚ and salt and water excretion. Moreover‚ there are important and opposing functions of both prostacyclin PGI2 and thromboxane TXA2 in maintaining the vascular homeostasis and good cardiovascular health‚ in detail‚ TXA2 is synthesised in the platelets by the action of COX-1 during the platelet activation‚ it increases platelet aggregation‚ vasoconstriction‚ and smooth muscle proliferation. In contrast‚ PGI2 is produced in the endothelial cells by the action of COX-2;
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Today I’m going to be speaking to you about the street gang known as the Bloods. I will be discussing the origin of the gang‚ some of the gang’s important members and the impact the gang has on the present day. It all began in 1971 when the gang that eventually came to establish the Bloods was created. The name of this gang was the Piru Street Boys and they were actually a set of the Crip gang‚ today’s biggest rivals of the Bloods. When the Piru Street Boys began their operations they were working
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