Transcription: Human blood, which transports substances between the body's cells, is composed of four main ingredients. Plasma, red blood cells, white blood cells, and platelets. Most of the blood is composed of plasma, a solution of ions, salts, nutrients, and wastes dissolved in water. This straw-colored fluid gives blood its liquid nature and allows blood components to circulate freely throughout the cardiovascular system. Red blood cells or erythrocytes transport oxygen to the body cells via the protein hemoglobin and carry carbon dioxide to the lungs for exhalation. White blood cells or leukocytes defen ...
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