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Unformatted text preview: Unit 3 Biological Sciences Chapter 6: Blood and the cardiovascular system • What are the functions of blood o Transportation Oxygen, nutrients, wastes, carbon dioxide and hormones o Defense Against pathogens, viruses and bacteria o Regular Functions Body temperature, water/salt balance, body pH • Composition of Blood Remember (blood is a fluid connective tissue) o Formed Elements: (produced in red bone marrow) Red blood cells/erythrocytes (RBC) • 5 million in a milliliter • Properties o No nucleus o Disk like surface to maximize space o 280 million hemoglobin molecules for oxygen • Production o Produced in Red Bone Marrow o Live 120 days o Erythropoietn (EPO) from kidney cells goes to red marrow when oxygen low Injected into blood to enhance athlete’s endurance o Old cells are destroyed by liver/spleen • Diseases o Anemia – not enough RBC or hemoglobin Makes you tired o Sickle-cell Anemia – genetic disease causes RBC to be sickle shaped and burst o Hemolytic Disease of the Newborn – incompatible blood types in body and cells rupture Before and after birth White blood cells/leukocytes WBC • 10 thousand in a milliliter • Different types (from most till least) o Neutrophils – bacteria 50 – 70% of all WBC’s Multi lobed nucleus Can move out of blood to fight o Lymphocytes – viruses 25-35% of all WBC’s Large nucleus Develop B and T cells that are important to immune system o Monocytes – viruses Uncommon WBC’s Largest WBC, horseshoe shaped nucleus Take care of debries from cuts o Eosinophils - Allergies Small percentage Bilobed nucleus Fight allergies o Basophils – allergies Smallest percentage U-shaped nucleus Release histamine to CAUSE allergies • Properties of WBC’s o From red bone marrow o Have nucleus o Found in blood/tissues o Fight infection o Live for days/months/years • How to exit blood o Slip through capillaries to reach infected area...
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- Fall '08
- Bone marrow, red bone marrow