transport oxygen rich blood from the alveoli back to the heart. Inspiration (the process of inhaling) begins as the external intercostals and diaphragm contract. When this happens‚ the lungs expand. After this‚ negative pressure is used to facilitate respiration. So‚ air moves from an area of higher pressure‚ which is the air‚ to an area of lower pressure in the lungs and aveoli. During inspiration the diaphragm and intercostal muscles contract. The diaphragm moves downwards‚ while the intercostal muscles
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Erasistratus’s model of the respiration and blood distribution is considerably more mechanical than Aristotle’s due to the technological advances that were thriving in Alexandria compared to Athens. Both scientists base their models of respiration and blood distribution in the body from technological-ladenness of observation. Erasistratus proposes that heart uses force propulsion to distribute air and blood throughout the arteries and veins. His concept focuses on “the filling towards what is being”
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What is the Marine Ecosystem? Marine ecosystems are among the largest of Earth’s aquatic ecosystems. It covers almost 70% of the earth’s surface. They include oceans‚ salt marsh and intertidal ecology‚ estuaries and lagoons‚ mangroves and coral reefs‚ the deep sea and the sea floor. They can be contrasted with freshwater ecosystems‚ which have a lower salt content. Why is the Marine Ecosystem important? Marine ecosystems are very important in to the overall health of both marine and terrestrial
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Pollution and Its Effects on Ecosystems By Malik Lockett 808 Pollutions of ecosystems can harm living organisms. It can cause death‚ the worst experience ever. Let’s learn about. A pollution is the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects. The main country that is experiencing pollution is Mexico. In Mexico City there is air pollution caused by smoke
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Introduction A chromosome is a minuscule threadlike part of the nucleus and a structured DNA in the form of genes carrying hereditary information (Bridges‚ 1938). Endomitosis is the process of mitosis of chromosomes without undergoing nuclear or cellular division to increase cell volume. This results in a single nucleus having many copies of a single chromosome (Painter & Reindorp‚ 1940). In this experiment‚ Drosophila melanogaster is reared in specific conditions and its salivary gland extracted
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The effects of human activity on ecosystems and biodiversity Agricultural Practice Biodiversity is a measure of the diversity among organisms in different ecosystems. "Diversity" in this definition includes diversity within a species and among species‚ and among ecosystems.’ Monoculture is when a farmer produces or grows one single crop over a wide area. The advantages to the farmer of monoculture are‚ “the reduced plant competition for nutrients‚ space and solar radiation‚ control of unprofitable
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Ecosystems: Change and Challenge The Structure of Ecosystems Ecosystem: a dynamic‚ stable system characterised by the interaction of plants and animals with each other and with the non-living components of the environment The components of an ecosystem are categorised as either biotic and abiotic Biotic means the living environment‚ components include: i). Vegetation (living and decomposing) ii). Mammals‚ insects‚ birds and microorganisms Biomass-the mass of material in the bodies
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just like other organisms‚ they must respire in order to survive. Respiration can be defined as the controlled release of energy from organic compounds to form adenosine triphosphate (ATP). The type of respiration that occurs is called aerobic respiration. It occurs when glucose and oxygen are present. It can be summarized by the equation: . Enzymes play a very significant part in respiration. During the different stages of respiration‚ enzymes that are often found in the matrix of the mitochondria
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this disorder has genetic origins as it is transmitted by parents to the children; that’s why it is called X-linked Adrenoleukodystrophy or X-ALD. It only affects males while females are carriers with the chance of develop a mild form of this disorder. As a neurological condition‚ we could say that
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Central Banking (FIN10908) Hong Kong Linked Exchange Rate System Hong Kong Linked Exchange Rate System Introduction Hong Kong’s Linked Exchange Rate system is a currency board system‚ which requires both the stock and flow of the monetary base to be fully backed by foreign reserves. It is the exchange rate system implemented in Hong Kong to stabilize the exchange rate between the Hong Kong dollar (HKD) and the United States dollar (USD). This means that any change in the monetary base is fully
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