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Unformatted text preview: Chapter 19: Cardiovascular System: Blood Composition of Blood o Blood is a type of connective tissue o Blood = plasma (55%, liquid matrix) + formed elements (45%, cells and cell fragments) Plasma o Plasma = is a colloid (liquid w/ suspended substances that don’t settle out of solution) 91% water Proteins : albumin (osmotic pressure; viscosity; transportation of fatty acids + bilirubin + thyroid hormones), globulins (transport and immunity), fibrinogen (clot formation) Hormones & enzymes (regulation), ions (osomosis; membrane potential; acid-base), nutrients, waste (urea; protein breakdown; bilibrubin (RBC breakdown product); lactic acid), gases (dissolved O2, C02, N) If spun right away in centrifuge, uppermost: plasma If allowed to sit for awhile, then centrifuge, uppermost is: serum Formed Elements o RBC (erythrocytes; majority), WBC (leukocytes), platelets (thrombocytes; cell fragments) o Production of Formed Elements Not an infinite life span Hemat/hemopoiesis: process of any blood cell production (all formed elements) In embryo and fetus, formed elements are produced in a # of locations: liver, spleen, thymus gland, lymph nodes, bone marrow After birth, red bone marrow becomes a source of formed elements • (in adult) btwn trabeculae of spongy bone...
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- Spring '10
- Chemistry, red bone marrow