BLOOD VESSELS. CLOSED SYSTEM FOR FLOW OF BLOOD BLOOD CARRIED THROUGHOUT BODY IN VESSELS.
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Transcript of BLOOD VESSELS. CLOSED SYSTEM FOR FLOW OF BLOOD BLOOD CARRIED THROUGHOUT BODY IN VESSELS.
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BLOOD VESSELS
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BLOOD VESSELS
•CLOSED SYSTEM FOR FLOW OF BLOOD
•BLOOD CARRIED THROUGHOUT BODY IN
VESSELS
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BLOOD VESSELS
• MAIN TYPES OF BLOOD VESSELS– ARTERIES– CAPILLARIES– VEINS
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ARTERIES
• CARRY BLOOD AWAY FROM HEART– AORTA
• LARGEST ARTERY IN BODY
– ARTERIOLES• SMALLES BRANCHES OF ARTERIES
• JOIN WITH CAPILLARIES
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CAPILLARIES
• CONNECT ARTERIOLES WITH VENULES
• THIN WALLS– ONE LAYER OF CELLS
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VEINS
• BLOOD VESSELS THAT CARRY BLOOD BACK TO THE HEART– VENULES
• SMALLEST BRANCHES OF VEINS
• CONNECT WITH CAPILLARIES
• VEINS ARE THINNER THAN ARTERIES– HAVE LESS MUSCLE TISSUE
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BLOOD COMPOSITION
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BLOOD COMPOSITION
• BLOOD CALLED A TISSUE – BECAUSE IT CONTAINS MANY KINDS OF
CELLS
• 4-6 QUARTS OF BLOOD IN THE AVERAGE ADULT
• BLOOD CIRCULATES THROUGHOUT BODY CONTINUALLY
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TRANSPORTATION
• OXYGEN FROM LUNGS TO BODY CELLS
• CARBON DIOXIDE FROM BODY CELLS TO THE LUNGS
• NUTRIENTS FROM THE DIGESTIVE TRACT TO CELLS
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TRANSPORTATION
• METABOLIC WASTE PRODUCTS FROM THE CELLS TO THE ORGANS OF EXCRETION
• HEAT PRODUCED BY VARIOUS BODY PARTS
• HORMONES PRODUCED BY ENDOCRINE GLANDS TO ORGANS IN THE BODY
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PLASMA
• FLUID OR LIQUID PORTION OF BLOOD
• 90 % WATER
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SUBSTANCES DISSOLVED OR SUSPENDED
• BLOOD PROTEINS – FIBRINOGEN – PROTHROMBIN
• NECESSARY FOR CLOTTING
– NUTRIENTS • CARBOHYDRATES AND PROTEINS
– MINERAL SALTS• CALCIUM & SODIUM
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PLASMA
• GASES SUCH AS – CARBON DIOXIDE – OXYGEN
• METABOLIC AND WASTE PRODUCTS
• HORMONES
• ENZYMES
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BLOOD CELLS
• SOLID ELEMENTS OF BLOOD
• THREE KINDS OF BLOOD CELLS– ERYTHROCYTES– LEUKOCYTES– THROMBOCYTES
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ERTHROCYTESRBC
• PRODUCED IN RED BONE MARROW
• 4 1/2 - 5 MILLION ERYTHROCYTES PER CC MM
• CONTAINS COMPLEX PROTEIN CALLED HEMOGLOBIN– COMPOSED OF PROTEIN MOLECULE
• GLOBIN
• IRON COMPOUND – HEME
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LEUKOCYTES WBC
• NORMAL COUNT IS 5 - 10 THOUSAN LEUKOCYTES
• LEUKOCYTES CAN PASS THROUGH CAPILLARY WALLS AND ENTER BODY TISSUE
• MAIN FUNCTION – FIGHT INFECTION
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PHAGOCYTOSIS
• PROCESS BY WHICH SOME LEUKOCYTES ENGULF– INGEST– DESTROY PATHOGENS OR GERMS
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Thrombocytes
• Platelets
• fragments or pieces of cells
• contain enzyme that stops bleeding
• 250,000 to 400,000 per cubic millimeter of blood
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