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It describes blood as a transport fluid moving oxygen, nutrients, hormones, and wastes through arteries, veins, capillaries, and the heart. The text breaks down the components of blood—plasma, red blood cells, white blood cells, and platelets—then explains their roles in oxygen delivery, defense, and clotting, supported by simple visuals and a 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BLOODCIRCULATES\n\nText:Merce Parramón  \nIllustrations:Marcel Socias  \nCómo Circula Nuestra Sangre C Copyright ParramónEdiciones,S.A.Published by Parramón Ediciones,S.A.,Barcelona,Spain.  \nHow Our Blood Circulates copyright ◎1994 by ChelseaHouse Publishers,a division of Main Line Book Co.All rights reserved.  \n135798642  \nComo circula nuestra sangre.EnglishHow our blood circulatesp.cm.—(The Invisible world)Includes index.  \nSummary:Describes how the circulatory system worksand what it does for the body.  \nISBN 0-7910-2127-0ISBN 0-7910-2132-7(pbk.)  \n1.Blood—Circulation—Juvenile literature.[1.  \nCirculatory system.]I.Chelsea House Publishers.II.Title.III.Series.QP103.C6513199493-19871612.1—dc20CIPAC  \nContents  \nThe Circulatory System4The Composition of Blood6Red Blood Cells8White Blood Cells 10Clotting12The Heart14How the Heart Beats16Circulating Oxygen 18Systemic Circulation20Blood Vessels22The Lymph System24Lymph Vessels26Simple Experiments28Glossary30Index 31  \nHOW OUR BLOODCIRCULATES  \n# The Circulatory System\n\nThe survival of the human bodydepends on a steady supply of foodand oxygen reaching all of its cells.Meanwhile,carbon dioxide andother waste materials produced by thecells must be removed.Thecirculatory system transports thcsematerials throughout the body.  \nThe materials are carried in a fluidknown as blood,which travelsthrough a complex system of tubescalled blood vessels.T'herc are threemain typcs of blood vessels—arteries,veins,and capillaries—and blood ispumped through them by a mass ofmusclcs known as the heart.  \nBlood picks up a fresh supply ofoxygen in the lungs beforc it ispumped to every cell.The oxygen-poor blood then returns to the heartand is pumped to the lungs for moreoxygen.  \nBlood also picks up other importantsubstances,such as nutrients from thedigestive system and hormones fromthe glands,and carries them to partsof the body where they are needed.At the same time,the blood picksup waste products and carries them tothe kidneys,lungs,and skin,whichhelp expel them from the body.  \n◀ One of the heart'schambers pumpsblood containingcarbon dioxide tothe lungs,where itis exchanged foroxygen.The bloodthenflows back toanother of theheart's chambers,and it is pumpedthrough the body,delivering oxygen,nutrients,andchemicals to thecells.The blood alsocarries wasteproducts to theparts of the bodythat will get rid ofthem.  \nA view inside a capillary,showingthe main components of the blood(numbered in the inset).The redblood cells(1)transport oxygen andcarbon dioxide.The white blood cells  \n(2)are part of the body's defensesystem.The platelets (3)help theblood form a clot after an injury.Thecapillary walls(4)are made up ofasingle layer of cells.  \n# The Composition of Blood\n\nOur blood consists of several types ofcells carried around in a yellowliquid called blood plasma.Watermakes up about 90 percent ofplasma,which contains nutrients,proteins,hormones,and wasteproducts in addition to the blood cells.  \nThere are three types of blood cells:red blood cells(erythrocytes),whiteblood cells(leucocytes),and platelets(thrombocytes).Red and whiteblood cells are also known ascorpuscles.  \nRed blood cells look like flattened,doughnut-shaped discs.There are  \n5.5 million in every .4 cubic inch ofblood(about the size of a pinhead).They contain a compound calledhemoglobin,which is rich in iron.Hemoglobin picks up oxygen in thelungs,which turns the hemoglobinbright red.As the blood goes throughthe body,the hemoglobin deliversthe oxygen to the cells in exchangefor the waste product carbondioxide.  \nWhite blood cells are much biggerthan red blood cells.There are between  \n4,000 and 10,000 in every .4 cubic inchof blood.Unlike red blood cells,white blood cells have a nucleus.Mostwhite blood cells can move aroundin the bloodstream,which enablesthein to play an important part inthe body's defense sy","cbCaiquqBOXM8Lmp","https://ap.wps.com/l/cbCaiquqBOXM8Lmp","pdf",2983897,"English","# The Circulatory System\n## The Composition of Blood\n## Red Blood Cells\n## White Blood Cells\n## Blood Platelets\n## Simple Experiments\n## Glossary\n## Index","[{\"question\":\"What is the circulatory system responsible for?\",\"answer\":\"It transports oxygen, carbon dioxide, nutrients, hormones, and waste materials throughout the body so cells can function and unwanted products can be removed.\"},{\"question\":\"How do red blood cells help the body?\",\"answer\":\"Red blood cells contain hemoglobin that picks up oxygen in the lungs and delivers it to cells, exchanging it for carbon dioxide as the blood circulates.\"},{\"question\":\"What role do platelets play when the body is injured?\",\"answer\":\"Platelets cluster around a broken blood vessel to help seal it and support the clotting process, helping prevent blood loss.\"}]","How Our Blood Circulates - The Invisible world - Circulatory System | PDF",1790712611,101]