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Word Count: 964
functions in the rapid internal transport of substancesYour bodys differentiated cells which performspecialized tasks cannot fend for themselves Differenttypes must interact in coordinated ways to maintain thecomposition volume and temperature of a tissue fluidsurrounding them the interstitial fluid A circulatingconnective tissue-blood-interacts with tissue fluidmaking continual deliveries and pickups that help keepconditions tolerable for enzymes and other moleculesheart generates pressure that keeps blood flowing Likemany anirnals you have a closed circulatory system-blood is confined within the continuously connectedwalls of the heart and blood vesselscapillary beds At such beds the flow fans out throughvast numbers of senall-diameter blood vessels calledhearts right half pumps oxygen-poor blood to thelungs where blood picks up oxygen and gives up car-bon dioxide The freshly oxygenated blood then flowsto the hearts left half This is the pulmonary circuit Bycontrast in a systemic circuit the Itft half of the heartpumps oxygenated blood to all tissues where oxygen isan elaborate network of drainage vessels picks upexcess interstitial fluid and reclaimable solutes thenreturns them to the circulatory system This network isBlood a connective tissue has multiple functions Ittransports oxygen nutrients and other solutes to cellsThe volume of blood depends on body sizeaverage-size adult humans is about 6 to 8 percentbody weight That amounts to about four or five quartsred blood cells vehite blood cells and platelets are itsaccounts for 50 to 60 percent of the total blood volumePlasena Plasma which is mostly water functions as atransport medium for blood cells and platelets It alsoserves as a solvent for ions and molecules includinghundreds of different kinds of plasma proteins Some ofthe plasma proteins transport lipids and fat-solubleErythrocytes or red blood ceils arebiconcave disks like doughnixts with a squashed-incount is the number of cells of a given type in a micro-I liter of blood The average number of red blood cells is54 million in males and 48 million in females arise from stem cetls in bone marrowEach platelet only lasts five to nine days buthundreds of thousands are
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