About the Author : His name is Guy Sajer. is a pseudonym of Guy Mouminoux (born 13 January 1926 in Paris)‚ author of The Forgotten Soldier. The son of a French and German marriage‚ ’Sajer’ is his mother’s maiden name. Since 1946‚ he has worked as a cartoonist under the pen names Dimitri‚ and Dimitri Lahache. Sajer states that he was an inhabitant of Alsace drafted into the German Wehrmacht at age 16 and subsequently fought in the elite division during World War II. After the war he wrote about
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How People Make Economic Decisions Craig Nickels ECO 212 July 26‚ 2010 Joshua Long How People Make Economic Decisions “Should I order the lobster or the chicken?” This is a choice a consumer may have when dining at a local restaurant. It also represents a deeper meaning when approached using the principles of economics. Three key economic principles that can be used in decisions people make concerning their time and money are people are rational‚ they respond to economic incentives‚ and
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Osmoregulation as a Homeostatic Mechanism using the Comparitive Melting-Point Method for two Crab Species. Abstract Two crab species‚ Plagusia and Cyclograpsus‚ were collected from a local estuary in the littoral and deep water zone for osmoregulation studies. To examine differences in osmoregulatory mechanisms among the species‚ haemolymph of the specimens was extracted once they were acclimated to varying concentrations of seawater. Using the comparative melting-point‚ capillary tubes were
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popular marine food animals such as lobsters‚ crabs‚ and shrimp. While mainly found in salt and freshwater environments‚ there are also terrestrial Crustacean such as woodlice and isopods. Crustaceans have three distinct body parts: head‚ thorax‚ and abdomen (also called a pleon). Excretion is the removal of toxic (nitrogenous) waste products of metabolism from the body. The waste end products of catabolism contain carbon‚ hydrogen‚ oxygen and nitrogen. Osmoregulation is based largely on controlled
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quarts of blood to sift out about 2 quarts of waste products and extra water everyday. Kidneys also produce various hormones. The function as two main functions- excretion and osmoregulation. Excretion is the process by which waste products and other non- useful materials are eliminated from an organism. Osmoregulation is active regulation of the osmotic pressure to maintain the homeostasis of the organism’s water content. In other word‚ it keeps the organism’s fluid from becoming too diluted or
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Fight or flight response The fight or flight response is a response to a stimulus that could threaten the survival of an organism. During the fight or flight response the hypothalamus sends signals to the sympathetic nervous system. This causes the body to tense up and become more alert. The hypothalamus also releases CRF which activates the adrenal cortical system. The anterior pituitary gland begins the secrete adrenocorticotropic hormone directly into the bloodstream. When the ACTH reaches
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Blood Water Homeostasis or Osmoregulation Osmoregulation is the process by which the body regulated the osmotic pressure of any organism’s fluids in order to keep the homeostasis of the organisms’ water level constant. Therefore osmoregulation is used to keep the bodily fluid from being too diluted or too concentrated. An osmotic pressure is used to measure the ability of water to move from one solution to another solution through osmosis. Osmotic pressure refers to tendency for a liquid solution
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keep your body temperature at a constant degree. Homeostasis maintains normality in the body in many different ways. Some examples include osmoregulation‚ thermoregulation‚ chemical regulation‚ and behavioral homeostasis. While homeostasis controls these processes‚ homeostasis must also go through a separate process of its own in order for things like osmoregulation to be carried out. These “inner processes” are called negative and positive feedback. These processes will be explained in depth throughout
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PRACTICAL 6: OSMOREGULATION AND EXCRETION Introduction Many animals need to control the water content of their body because the concentration of their body fluids is different to that of their environment. The process by which the amount of water and concentration of soluble ions in the body are regulated is called osmoregulation. In most cases the organs which are responsible for osmoregulation are also involved in the excretion of metabolic waste products. In this practical you will
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Osmosis Experiment Diana Arrowood Grand Canyon University BIO-100L Biology Concepts September 16‚ 2011 Osmosis Experiment Directions Use the information below to complete the Osmosis Experiment. Materials 1 fresh baking potato Water Salt Four small containers (i.e.‚ drinking cups or clear glasses) A metric ruler Methods and Procedure 1) Place 1 cup (236 ml) of water in each of the 4 containers. In 2 of the containers‚ add 1 tablespoon (14.8 ml) of table salt and mix well until
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