BSCI 201 Lecture Notes - Bone Marrow, Buffy Coat, Fetal Hemoglobin
18 Feb 2014
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Document Summary
The only fluid tissue in the human body. Erythrocytes = red blood cells transports oxygen and carbon dioxide. Leukocytes white blood cells the defend body against pathogens. Platelets cell fragments formed from megakaryocytes, important in blood clotting. Cytes means mature cells are leukocytes are mature white blood cells. Non living matrix: plasma is the fluid and solutes. When blood is centrifuged centrifuging separates substances by their weight. Erythrocytes sink to the bottom (45% of blood, a percentage known as the hematocrit) Buffy coat contains leukocytes and platelets (less than 1% of blood), the buffy coat is a think, whitish layer between the erythrocytes and plasma. Plasma rises to the top (55% of blood) Blood coagulates so there needs to be a chemical that stops it from coagulates. Infection & cancer: a lot of buffy coat within a blood sample. Water solvent for carrying other substances; absorbs heat. Osmotic balance, ph buggering, regulation of membrane permeability.
