chapt18 v0106 Blood

chapt18 v0106 Blood - Chapter 18 The Circulatory System...

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1 Chapter 18 The Circulatory System: Blood Blood Functions and properties Blood cell production Erythrocytes (RBC) Leukocytes (WBC) Hemostasis Blood types
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2 Functions and Properties of Blood Function: Helps cells get nutrition, gets rid of waste Two types of fluid: Blood and Interstitial Blood is the transported Interstitial fluid is the diffuser
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3 Hematology The study of blood (Hemo = blood, -ology = study) Blood is as unique as your fingerprints Most cells cannot move around to get oxygen and nutrients and get rid of waste, the blood system does this for them. INTO the BLOOD- Oxygen from the lungs, nutrients from the small intestines OUT OF the BLOOD- Waste goes out the kidneys, skin and large intestine
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4 Two Functions of Blood 1. Transport- oxygen, nutrients, waste 2. Protection- clotting, immunity = white blood cells (WBC), interferon, complement
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5 Physical Characteristic of Blood Alkaline: 7.4 pH avg. 8 % of body weight (if you were a $100 bill, about $8 of you would be blood) Blood volume: 1.2 gallon female, 1.5 gallon male Temperature of the blood is a little higher then body temperature, WHY? ______________
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6 Components of Blood If Blood is spun down (centrifuged), we see two parts: 1. Plasma- liquid If this is allowed to clot what remains is called “serum” 2. Cells- bottom of tube Cells of the blood are mostly red blood cells (RBCs). The rest, only 1%, is basically platelets and white blood cells (WBCs)
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7 Centrifuging Blood Centrifuging blood forces cells to separate from plasma Hematocrit is the % of total volume of cells Normal crit = females 42 avg., males 47 avg.
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8 Hematocrit Tells Us… Hematocrit of 40 means that 40 % of the blood is __ __ __ s Does a doctor do a hematocrit to determine the amount of WBCs or platelets? YES NO Then what is in the buffy coat? ________ (A vampire slayer?) Abnormal: Low crit =Anemia, decreased ________ High crit = Polycythemia
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9 Polycythemia Polycythemia is an excess of RBC primary polycythemia is due to cancer of erythropoietic cell line in the red bone marrow Hematocrit of 80% secondary polycythemia from dehydration, emphysema, high altitude, or physical conditioning Dangers of polycythemia increased blood volume, pressure and viscosity can lead to embolism, stroke or heart failure
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10 Plasma Proteins 3 major categories of plasma proteins Albumins are most abundant plasma protein Globulins (antibodies) provide immune system defenses alpha, beta and gamma globulins Fibrinogen creates fibrin threads that causes blood to clot
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11 Formation of Blood Cells Hemopoiesis- Blood making Lymphoid hemopoiesis occurs in widely distributed lymphoid tissues (thymus, tonsils, lymph nodes, spleen red bone marrow produces RBCs, WBCs and platelets SEQUENCE: 1.) Stem cells 2.) Committed cells 3.) Precursor Cells 4.) Final blood cells
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Hemopoiesis
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This note was uploaded on 09/25/2011 for the course BSC 1085 taught by Professor Staff during the Fall '09 term at Broward College.

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chapt18 v0106 Blood - Chapter 18 The Circulatory System...

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