Caffeine effect on Daphnia’s heart rate Prepared for: Androniki Kloni By: Maria Mitsi October 6‚ 2013 Abstract Caffeine is a bitter‚ white crystalline xanthine alkaloid and a stimulant drug. Caffeine is found in varying quantities in the seeds‚ leaves‚ and fruit of some plants‚ where it acts as a natural pesticide that paralyzes and kills certain insects feeding on the plants‚ as well as enhancing the reward memory of pollinators. An experiment was held‚ on an aquatic
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HUMAN PHYSIOLOGY REPORT DAPHNIA Aim The aim of this experiment is to investigate the effect of temperature and various substances on the heart beat of Daphnia‚ a water flea. Introduction Daphnia belongs to a group of small‚ freshwater crustaceans of the order Cladocera commonly called water fleas. They are very suitable for laboratory studies due to the nature of their transparent exoskeletons. Hence‚ it is possible to watch Daphnia hearts without dissecting them. Daphnia is ectothermic and easily
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Addiction to Nicotine Robin S. Combs Com/156 August 18‚ 2013 Kathryn Voigt Addiction to Nicotine There are many types of addiction‚ gambling‚ eating‚ drinking‚ smoking‚ drugs‚ or any other behavior that is habit forming. One of the strongest addictions know today is to nicotine. After researching the effect of nicotine addiction on humans this information came to light‚ “The relapse rate for smokers who try to quit the habit is discouragingly high: about 90 percent ultimately begin smoking
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reduce anxiety‚ along with stress. Nicotine is one of the many chemicals in tobacco. When inhaled‚ the nicotine diffuses into the pulmonary blood and enters the systemic circulation‚ quickly reaching the brain. When in the brain the nicotine binds to the acetylcholine receptors (nAChRs) (Rosenthal‚ D. G et al. 2011). An important neurotransmitter is dopamine‚ which is critical to the acute reward pathways associated with nicotine abuse‚ along with other drugs. Nicotine stimulates the dopaminergic transmission
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The blood pressure is raised due to smoking and increase the risk of blood clots. All together raises the chances of a stroke. If smoking is continued the risk of heart disease if the smoker has had a heart attack or heart bypass surgery. Nevertheless‚ the smoking does not only affect the individual but those around them‚ referred to as second-hand smoke. b. Smoking effects on respiratory system The smoke causes irritation in the trachea and larynx. May results in reduced lung function and breathless
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long term health complications – lung cancer‚ chronic obstructive pulmonary disease and heart disease being the leading causes of death (196). Nicotine‚ although it is not toxic relative to tobacco‚ it is responsible for the development of psychological dependence and withdrawal symptoms (211). It does this ultimately because chronic tobacco use causes the brain to adapt to the functional antagonism of nicotine by upregulating nicotinic receptors (202) and becoming accustomed to its positive subjective
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A-LEVEL BIOLOGY LAB REPORT NAME: NURUL AYUNI BT SABRI GROUP: 11SC4 TITLE: THE EFFECT OF CAFFEINE ON HEART RATE LECTURER : MDM ZAKIAH BINTI ZAKARIA TITLE The effect of caffeine on heart rate OBJECTIVE To determine the effect of caffeine on heart rate of daphnia INTRODUCTION Caffeine‚ medically known as trimethylzanthine. Its chemical formula is C8H10N4O2. When in pure form‚ caffeine is a white crystalline powder that taste very bitter. 1The most common way
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human’s heart rate to speed up‚ decrease‚ or stay the same‚ the volume of sound has a high effect on the heart. However‚ if people will let down the volume of sound‚ others would not be mannered by the increase in volume managing to the deadly heart attack. Sound within the community‚ for instance‚ traffic can cause a human’s heart rate of increase. Problem of heartbeat tends to be solved by seeing what kind of sound causes the increase of heart rates to place a termination to increase of heart rate
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Investigative Quest The purpose of this experiment was to find out how music affects the female human heart rate. Hypothesis My hypothesis is that female resting heart rate will increase as the music tempo increases. If the tempo is slower the heart rate will stay at resting heart rate or decrease. Variables The variables used in this experiment were: • The tempo of the music. • The subject’s heart rate. • The subject’s age. Controls The controls used in this experiment were: • How long the
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show the difference in heart rates before and during intense exercise. Aim: The aim of the investigation was to discover how the heart rate varied with the intensity of exercise. The heart rate is a term describing the regularity of the cardiac cycle. The heart rate is the amount of times it contracts (beats) in a unit of time‚ nearly always per minute. At rest the adult female’s heart rate regulates 75 bpm (beats per minute) but this varies between people. If the heart rate is measured before‚ during
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