CORE PRACTICAL ONE Describe how the effect of caffeine on heart rate in Daphnia can be investigated practically‚ and discuss whether there are ethical issues in the use of invertebrates. Daphnia‚ the water flea‚ is a small freshwater crustacean which lacks physiological methods of maintaining a constant body temperature. This means that if the environmental temperature changes‚ its body temperature does so too and its metabolic rate will be expected to rise or fall accordingly. So the temperature
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alcohol and environment on Daphnia Magna. ABSTRACT In this experiment daphnia magna a semitransparent fresh water crustacean‚ are used to study the effects of water‚ alcohol and caffeine on heart rate. Daphnia was placed on a clean deep well slide. This was placed under the microscope and brought into focus on the best objective and light contrast. The heart rate was observed and counted within 15seconds and recorded on a table. Introduction Daphnia magna is a fresh water ectothermic
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Observing and Analyzing the Behaviors of Daphnia‚ Pill Bugs‚ Amoeba and Uglena Under Certain Experimental Conditions Testing Reactions to Gravity‚ Light and Food Jacob Kluth and Kelsey Jankowski Introduction This lab has introduced the use of daphnia‚ pill bugs‚ amoeba and Uglena. We the AP Biology students were first introduced to the test subjects to test his or her capability of handling living organisms for upcoming science experiments. The AP Biology students were asked to create original
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____________ of ____________ and ____________ on ____________ in Daphnia. (Length: not more than two pages of text in 12-point font‚ double-spaced; plus one page each for Table 1 and Figure 1.) Introduction: • Provide a few sentences of background information on the effects of these two drugs on heart rate in Daphnia or other animals (including humans). Cite the source(s) of your information‚ such as (Castle and Paulson 2010) for your laboratory manual. Also include the appropriate sources
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Does caffeine affect heart rate? In this experiment we were examining the effect of caffeine on the heart rate of Daphnia which are water fleas. In my opinion I think that the caffeine will affect the heart rate because when the caffeine enters your blood from the stomach and small intestine it begins to stimulate your central nervous system‚ the Caffeine stimulates receptors in the cells of your heart to increase your heart rate. The increase of this heart rate speeds up your blood flow as well
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pollinators. An experiment was held‚ on an aquatic invertebrate called ‘Daphnia’‚ to investigate the effect of caffeine on its heart rate. The fact that Daphnia is a transparent organism facilitates the experiment as it allows us to see its internal organs. Different caffeine solutions of different concentrations were used including one control solution without any caffeine in it at all. A caffeine solution is placed onto a Daphnia and the number of its heart beats within 10 seconds was counted. This
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1.Dependent Variable: plasma levels of glucose‚ ketones‚ insulin‚ and glucagon 2.Independent Variable: food and beverage intake 3.Controlled Variables: physical activity‚ caffeine and alcohol intake‚ gender‚ age‚ BMI 4.Why were physical activity and caffeine and alcohol intake the controlled variables? 5.What type of assay was used to measure plasma glucose and ketone levels? 6.What type of assay was used to measure plasma insulin and glucagon levels? 1.When was plasma
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LABORATORY REPORT Activity: Blood Glucose Regulation Name: Brent Goo Instructor: Thomas Redenbaugh Date: 12.23.2014 Predictions Plasma glucose levels will be highest 1-3 hours after the meal Plasma ketone levels will be highest before the meal (fasting) Plasma insulin levels will be highest immediately after the meal (0 hr) Plasma glucagon levels will be highest 1-3 hours after the meal Materials and Methods Dependent Variable plasma levels of glucose‚ ketones‚ insulin‚ and glucagon Independent
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it is thought to be the cause of depressive symptoms. Norepinephrine is a hormone produced by the adrenal medulla‚ similar in chemical and pharmacological properties to epinephrine (also a hormone secreted by the adrenal medulla in response to stimulation to the sympathetic nervous system). Norepinephrine and epinephrine are the two active hormones that cause some of the physiological expressions of fear and anxiety. It appears that
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a pheochromocytoma? Epinephrine and norepinephrine in large quantities 3. Why does elevated urinary level of VMA ( a metabolite of epinephrine and norepinephrine) suggest the presence of a pheochromocytoma? Why is it necessary to do a 24-hour measurement of VMA‚ rather than a spot-urine test? VMA which is a metabolite of epinephrine and norepinephrine is secreted in the urine. With the presence of pheochromocytoma which produces large amounts of epinephrine and norepinephrine‚
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