PHYSIOLOGY OF THE CIRCULARTORY SYSTEM

PHYSIOLOGY OF THE CIRCULARTORY SYSTEM - PHYSIOLOGY OF THE...

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PHYSIOLOGY OF THE CIRCULARTORY SYSTEM INTRODUCTION: In ectothermic animals there is a direct relationship between the rate of many physiological activities and environmental temperature because they gain their heat from the environment. This is why a snake or lizard can hardly move when it is cold but becomes quite active after warming in the sun. Endothermic animals such as humans can regulate their body temperature by heat generated through metabolism. (Note: A homeotherm is an animal that maintains a constant body temperature and a poikilotherm is an animal whose body temperature changes when the temperature of its environment changes.) Daphnia , being an ectotherm increases its rate of metabolism as environmental temperatures increase. An increase of 10 o C results in an approximate doubling of the metabolic rate. Physiological processes such as heart rates and oxygen consumption are used to determine Q 10, a measurement of an animal’s sensitivity to temperature. Heart rate is an indication of metabolism for aerobic organisms. Drugs known as stimulants increase the body’s metabolism. Other drugs, known as depressants , slow the rate of metabolism. Heart rate is one indicator of increased or decreased metabolism. Daphnia is an ideal tool for the study of drugs on metabolism for the following reasons: They have short life span They can be propagated easily in large numbers Their body is transparent making it easy to observe heart beat under microscope
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This note was uploaded on 04/18/2008 for the course CHEM 1034 taught by Professor Devicaris during the Spring '08 term at Temple.

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PHYSIOLOGY OF THE CIRCULARTORY SYSTEM - PHYSIOLOGY OF THE...

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