blood. blood transports substances and maintains homeostasis in the body only fluid tissue in...
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Blood transports substances and maintains homeostasis in the body Only fluid tissue in human body Hematophobia = fear of bloodTRANSCRIPT
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BLOOD
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Blood transports substances and maintains homeostasis in the body
Only fluid tissue in human body
Hematophobia= fear of blood
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Hematocrit - volume of blood cells in a sample, should be 45%. The remaining fluid is plasma (55%). To determine the percentages, blood is placed in a centrifuge
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Three Types of Blood Cells red blood cells (erythrocytes)white blood cells (leukocytes)platelets (thrombocytes)
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Biconcave discs5 million per cubic millimeterLack nuclei
HEMATOPOEISIS – formation of blood cells (bone marrow)
Liver & Spleen - phagocytosis
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Elements Critical to RBC Production
• Folic Acid• Vitamin B12• Iron
• Too few RBC = anemia
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Oxygen Levels
Oxyhemoglobin = plenty of oxygen; bright red
Deoxyhemoglobin = low in O2, “bluish red”
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WHITE BLOOD CELLS(Leukocytes)
• General function is to protect the body against disease
• There are several different kinds of WBCs
Granulocytes (granular cytoplasm) Neutrophils, Eosinophils, Basophils
Agranulocytes (lacking granular cytoplasm)Monocytes, Lymphocytes
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Neutrophil (nucleus has several lobes)
Active phagocytes60% of WBC
Present in the pus of wounds
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Basophil Produces Heparin and Histamines
Important in Inflammatory Reaction
1% WBC
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Eosinophil
Mainly attack parasites2% WBC
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Monocyte (larger cell, horseshoe shaped nucleus)
Become macro-phages
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Lymphocyte(nucleus is dark and takes up almost whole cell; almost no cytoplasm seen)
Defense against invaders
Yield Antibodies30% WBC
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Left: Lymphoctye | Right: Neutrophil
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Platelets (thrombocytes)
Blood clots and vessel repair
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Plasma Proteins
• Albumins – blood pressure• Globulins (alpha, beta, gamma) – transport
lipids and antibodies for immunity• Fibrinogen – important for blood clotting
Fibrogen • Fibrin
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PLASMA
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This machine removes the plasma from the blood and returns the RBC’s to the donor.
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HEMOSTASIS
The process of stopping bleedingInvolves the coagulation and clotting of the
blood to seal the site of damage
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1. Blood Vessel Spasm2. Platelet plug3. Blood coagulation
conversion of fibrinogen to fibrin
*thrombin is an enzyme that causes the conversion
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Hemostasis
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• THROMBUS – blood clot (abnormal)
• EMBOLUS – when the clot moves to another place.