15_Blood

15_Blood - BLOOD Chapter 21 Review What are the four types...

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BLOOD Chapter 21
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Review… What are the four types of tissue? What are the four types of connective tissue? What is the common origin for all connective tissues?
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Composition of Blood Plasma Straw-colored liquid composed of water, proteins, and other solutes Generally makes up about 55% of blood Formed Elements Buffy coat Composed of leukocytes (WBCs) and thrombocytes (platelets) • Forms less than 1% of a blood sample – Erythrocytes (RBCs) • Typically make up about 44% of blood
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Hematocrit Percentage of blood volume made of red blood cells Typical values – Males 42-56% – Females 38-46% Can vary with hormone changes and altitude
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Blood Doping Athlete donates RBCs to himself A unit of blood is removed and stored Body replaces this lost blood Unit of blood is injected back into body, increasing the hematocrit Blood doping can also be done with EPO EPO (Erythropoietin) increases RBC production Thought to favorably affect muscle performance Dangerous because of increased blood viscosity
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Functions of Blood Transportation Oxygen and carbon dioxide - RBCs Nutrients, hormones, and waste products - Plasma Regulation Absorbs heat and distributes throughout the body - Plasma Constrict and dilate to regulate temperature - Vessels Regulates body pH and fluid levels in cardiovascular system Protection Protects from infection - WBCs Transports infection-fighting antibodies - Plasma Forms blood clots - Platelets
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15_Blood - BLOOD Chapter 21 Review What are the four types...

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