Blood = medium for the transport of substances around body • Composed of: ⇒ Mostly H 2 O plasma (55-60%)- 90% water- 2% ions, gases, nutrients, hormones- 8% plasma proteins ⇒ Red Blood Cells (40-45%) ⇒ WBC, platelets, proteins , etc (1%) Cellular Elements in blood = Erythrocytes, Leukocytes, and Platelets • Plasma = liquid part of blood ⇒ 99% are erythrocyte cells ⇒ Hematocrit is % of total blood occupied by erythrocytes ⇒ Plasma is 90% H 2 O Functions of Plasma Proteins • Estb. osmotic gradient btwn blood & interstial fluid • Buffer ph changes • Aid in blood-borne substance transportation • Immunity as antibodies • Fibrinogen = key to blood clot RBC = Erythrocytes • Transport O + CO 2 & H ions • Diameter = 8um • No nucleus or organelles cant reproduce • Is a package of hemoglobin molecules + Fe • Flexible PM slides through caps Hemglobin = 2 parts • Globin = 4, folded polypeptide chains • Heme (Fe) = non-protein part ⇒
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