Blood & Heart Blood is the transport medium for carrying nutrients, signaling molecules, respiratory gases and waste products to & from our body tissues

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Blood is the transport medium for carrying nutrients, signaling molecules, respiratory gases and waste products to & from our body tissues  Blood circulation is initiated by the pumping action of... the . Blood leaves the in arteries, which branch repeatedly until they become tiny capillaries.  From the capillaries, the O2 deficient blood flows into veins, which return it to the  Blood is than pumped to the lungs where it picks up O2 and releases carbon dioxide & than returns to the to be pumped throughout the body once again.  Blood accounts for about 8% of body mass; it’s a specialized type of connective tissue in which blood cells, called formed elements, are suspended in a fluid called plasma – a straw-colored, sticky fluid. Plasma is 90% H2O, contains over 100 different kinds of molecules [Show More]

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