Temperature on the Heart Rate of Daphnia magna Joseph Ezra Gallo BY124L MW 8:30-11:30 Introduction Ectothermic animals are animals whose body temperature is affected by their surroundings. This means that if the environment is cold the animal will be cold. If the environment is warm the animal will be warm. This is because the animal doesn’t have the capability of regulating its body systems to keep a constant body temperature. When an ectothermic animal is cold‚ its heart rate will lower. When
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Investigating the Effect of Caffeine on the Heart Rate of Daphnia Daphnia are extremely small aquatic invertebrates. They are transparent‚ so you are able to see their internal organs; this means it is easy to monitor their heart rate by observing them through a microscope [1]. Physiological results from caffeine consumption include the stimulation of heart rate‚ blood pressure‚ metabolism‚ body temperature and alertness. [2] In this practical investigation the aim was to determine whether the hypothesis
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with cover slip in order to examine its heartbeat by using the microscope. Aim In this Lab we will study the effect of different concentrations of adrenalin on the heart rate daphnia‚ the water flea. It is expected to recognize a threshold of the daphnia in its reaction the three different adrenalin concentrations‚ in terms of heart rate. Background The endocrine system works with the nervous system to regulate and coordinate body functions. While the nervous system works quickly and sends messages
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The Effects of Alcohol vs. Caffeine on Water Flea ’s Heart Rate. Title Page Abstract For our most recent experiment we tested the effects of immersing water fleas in caffeine and alcohol to see the effects on their heart rate. Before the experiment we hypothesized that if you place the water fleas in alcohol then their heart rate will slow down‚ and if you place them in caffeine then their heart rate will raise. For this experiment we needed water fleas‚ tap water‚ two pipettes
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Coronary arteries supply the heart with a constant supply of blood. These arteries are essential‚ providing oxygen and nutrients that keep the heart constantly pumping. Arteries have three layers including the external layer‚ tunica external‚ middle layer‚ tunica media and the inner layer‚ called the tunica intima. The outer layer is made up of connective tissue with elastic and collagenous fibers. Tunica media is the thickest layer composed of smooth muscle and can change the diameter of the arteries
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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 does its heart rate. Daphnia has a transparent body which allows one to see its organs. This is why Daphnia is often used in experiments dealing with heart rate. Daphnia inhibits regions
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- 2006 RESULTS: In this experiment the effect of different hormones on heart rate of _Daphnia_ was examined. It was investigated which substances act as stimulants and which substances act as depressant. Initially‚ _Daphnia_ was placed on depression slide under the microscope and the average heart rate was determined. Subsequently‚ _Daphnia_ was treated with different type of hormone and the effect on Daphnia heart rate was observed. It was investigated which substances act as stimulants and which
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through cellular respiration‚ and in turn‚ an athlete would heighten the intensity of the workout for a longer period of time becoming a better athlete. The VO2 Max of a person can be affected by mass‚ time it took to walk necessary distance‚ and heart rate. Each variable is in turn varied be age and gender. The greater the value for VO2 Max the greater the efficiency of the cardiovascular system. VO2 max plays a major role in the aerobic energy system because an increased VO2 max permits more oxygen
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stretching exercises. 2. Practice stepping up onto and down from the step before you begin the test. Each step has four beats: up-up-down-down. Males should perform the test with the metronome set for a rate of 96 beats per minute‚ or 24 steps per minute. Females should set the metronome at 88 beats per minute‚ or 22 steps per minute. 3. Set the metronome at the proper rate. Your instructor or a partner can call out starting and stopping times; otherwise‚ have a clock or watch within easy viewing
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around the body and play an essential part in providing the horse with its increased need for oxygen during exercise. They allow the musculoskeletal system to use energy to facilitate motion. The cardiovascular system comprises the heart‚ blood vessels and blood. The heart pumps blood around the body via the blood vessels which carry deoxygenated and oxygenated blood to and from the lungs. The red blood cells contain a protein called haemoglobin which binds oxygen and carries it to the muscles. The
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