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Unformatted text preview: About 90% - 92% water Other about 1% includes inorganic substances, antibodies, enzymes, hormones, etc. ,JLl FORMED ELEMENTS Comprise 40% - 50% of blood volume Made up of various blood cells: ERYTHROCYTES - red blood cells LEUKOCYTES - white blood cells PLATELETS — (Thrombocytes) ERYTHROCYTES Red Blood Cells Small, elastic, non-nucleated, bi-concave discs about 7 microns in diameter On average about 5,000,000 per cubic mm About 95% of 3 RBC is an iron-containing proteinl] HEMOGLOBIN Life span of a RBC is approx.. 120 days ERYTHROCYTE LIFE SPAN AND DESTRUCTION Life span of about 120 days 3 (+/-) Cell membrane gets increasingly thin and finally ruptures Cell fragments broken down by reticulo- ll endothelial of the liver and other organs (spleen) Iron retained, used to produce new RBCs in marrow Cell membrane broken down, used to produce BILE by the liver (needed for fat digestion in sm. intest.) SAMPLE EXAM QUESTIONS Which of the following is a red blood cell? Leuko te Monocyte Lymphocyte None of the above Of the following components, which is no; a formed element? Platelet ...
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