information Daphnia Magna is an arthropod that can grow up to 5 mm. It is a filter feeder meaning it feeds off of suspended particles in the water. Daphnia can consume particles that range from 1µ to 50µ. The heart of Daphnia is located dorsally meaning it’s located in the back. The heart rate of Daphnia can range due to many variables‚ one being temperature. "At a temperature averaging 20o C its heart rate is about 200 beats per minute."2 As the temperature surrounding the Daphnia decreases so
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Nicotine is an alkaloid present in plants of the Family Solanaceae. Most commonly found in tobacco (Nicotiana tabacum)‚ nicotine serves as a plant secondary chemical to protect plants against insects and other herbivores. Nicotine is an addictive stimulant in mammals‚ and is commonly used in cigarettes‚ cigars‚ pipes‚ and chewing tobacco. Nicotine can be administered to the body in many ways: orally through smoking tobacco‚ inhaling vaporized nicotine‚ or ingesting nicotine substances such as gum
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aim of this practical is to investigate the effect of exercise on heart rate and breathing rate. We will use a digital heart rate monitor strapped on our chest while we perform different levels of exercise. A digital watch is also provided which receives signals from the heart rate monitor and displays your current heart rate on the screen. To measure the breathing rate at different levels of exercise‚ we measure the breathing rate before physical activity by counting the number of breaths in 10 seconds
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Does caffeine affect heart rate? Background Information: Caffeine is a bitter white crystalline xanthine alkaloid that acts as a psychoactive stimulant drug. A German chemist‚ Friedrich Ferdinand Runge‚ discovered it in 1819. Plants produce caffeine as an insecticide. It is found in varying quantities in the beans‚ leaves‚ and fruit of over 60 plants‚ where it acts as a natural pesticide that paralyses and kills certain insects feeding on the plants. Cocoa in South America‚ coffee in Africa
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and access to a healthy culture of Daphnia. Students can readily follow this procedure working in pairs. Because of the variability of results between individual Daphnia it is not appropriate to make conclusions from one set of results‚ so each pair (or group) of students should carry out more than one investigation to contribute to the class set. One option is to record a live video of a sample Daphnia‚ during a time period in which students count the heart beats. Then‚ you can replay the video
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Investigating the effect of coffee on the heart rate of daphnia Aim: To find out the effect of different caffeine concentrations on heart rate in daphnia Independent variable: • Caffeine concentration Dependent variable: • Daphnia heart rate Controlled variables: • Size of daphnia • Habitat from which the daphnia is obtained • Temperature of the surrounding How the variables can be controlled: • Equally sized daphnia should be used in the experiment • All daphnia should be collected at a same
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health threat than all other drug substances combined. Smokers have much higher rates of heart disease‚ stroke and cancer than nonsmokers. This is why the tobacco industry fought back and tried to prove the contrary‚ it took many years for them to admit the adverse effects on health‚ but have not yet admitted the dependence of nicotine use. There are contradictory views on the nature of nicotine dependence. Nicotine is a reinforcing substance and produces physical and mood-altering effects in your
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Nicotine is an addictive drug which basically means that the use of nicotine causes reactions in the brain that makes the person want to use more and more of the drug or substance. Addictive drugs cause withdrawal symptoms that can be unpleasant. Breaking an addiction can be very unpleasant and difficult due to the fact that the person breaking the addiction has to go through withdrawals. Nicotine is historically one of the most difficult addictions to break due to the withdrawal symptoms. When someone
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The Chemical Effects of Nicotine on the Central Nervous System and the Adrenal Medulla An Australian Health Survey conducted in 2011-2012 concluded that 3.1 million Australians are current smokers. (Australian Bureau of Statistics‚ 2013). This means that 14% of Australia’s population are current smokers compared to more than 40% in the 1980’s – a dramatic decrease with the smoking rate continuing to decline each year. Now there are many factors that can be considered for this drop such as the
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The popular name for Daphnia is ‘water fleas’ because they resemble fleas in shape and movement. Unlike fleas‚ which are insects‚ Daphnia are crustaceans classified under the scientific order‚ Cladocera. The purpose of this experiment was to examine the alertness of Daphnia ambigua alertness at different temperatures. It involved the incubation of 30 Daphnia ambigua in three 100ml beakers. Exposing each beaker to a different temperature revealed that temperature of the surrounding environment had
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