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InterviewSolution
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Observe the table given below and analyse the questions.Name of the animalWeight of the bodyWeight of the heartNo. of beats/minBlue whale1,30,000 kg750 kg7Elephant3000 kg12-21 kg46Man60 – 70 kg300 gm76Coaltit(Bird)8 gm0.15 gm1200A) Why heart beat is less in animals with more weight?B) Why heart beat is more in animals with less weight? C) What is the relationship between weight of the body and rate of heart beat? D) Why the weight of heart is less than body weight? |
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Answer» A) The animals with more weight usually have weighted hearts. In one heart beat the largesized hearts sends high amounts of blood to circulatory system. It takes time for the fulfilment of heart. Hence heart beat is less in animals with more body weight. B) Usually the heart is very small in less weight animals. When the animal shrinks or contracts , its heart actually decrease the volume of blood proportionately. It can compensate for the reduced volume by increasing the rate at which it can supply blood to all body parts. C) As the weight of the body of the animal increases the rate of heart beat per minute decreases. And also as the weight of the body decrease the rate of heart beat increases. D) Usually the body of an organism is made by number of organs which makes the body functional. As all the body parts constitute the whole organism, the heart one of the organ is usually has less weight than body weight of an animal. |
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