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InterviewSolution
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Given alongside is a simple diagram of the circulation of blood in a mammal showing the main blood vessesl, the heart, lungs and body tissues. The blood vessel labeled 6 contains deoxygenated blood and the valve leading to it has three semilunar pockets.(i) Name the blood vessels of organs marked by number 1 to 8. (ii) What do you mean by the term ‘double circulation’ of 6 blood in mammal?(iii) What is diastole? |
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Answer» (i) 1. Veins from tissues 2. Superior vena cava 3. Pulmonary vein 4. Right ventricle 5. Left ventricle 6. Pulmonary Artery 7. Aorta 8. Lungs (ii) The heart is said to have double circulation because the blood passes through the heart twice. 1. It first leaves through the right ventricle, goes to the lungs and the returns to the left auricle of heart (pulmonary circulation) 2. It leaves through the left ventricle, circulates through the body, and again returns to the right auricle of heart (systematic circulation) (iii) Diastole is the phase of relaxation of the heart muscles during which the heart chambers fill with blood and the supply of food to the cardiac muscle is improved. |
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