Blood Chapter 18

Composition of Blood Plasma < 55% Erythrocytes < 45% Leukocytes and Platelets < 1%

Functions of Blood Deliver Oxygen and Nutrients Transport Metabolic Waste Transport Hormones Maintain Body Temperature Maintain Body pH Maintain fluid volume in circulatory system

Functions of Blood Prevents Blood Loss (platelets) Prevents Infection (Antibodies)

Composition and Function of Blood Plasma Straw colored, sticky

Composition and Function of Blood

Composition and Function of Blood Erythrocytes – Red blood cells (RBCs) Biconcave discs No nucleus

Composition and Function of Blood Made up of Hemoglobin and Water and Fibrous Protein, Spectrin, which allows for shape change

Composition and Function of Blood Job is to pick up and deliver oxygen/nutrients to body cells Also transport Carbon Dioxide back to Lungs

Composition & Function of Blood A single RBC contains about 250 million hemoglobin molecules Each cell carries about 1 billion molecules of Oxygen

Composition & Function of Blood Oxyhemoglobin = Heme + O2 Deoxyhemoglobin = Heme - O2 Carbaminohemoglobin = Heme + CO2

Composition & Function of Blood RBCs life span is 100-120 days

Composition & Function of Blood Leukocytes (WBC) include: Granular – Neutrophils; eat bacteria Eosinophils; kill parasitic worms Basophils; release histamines

Composition & Function of Blood Agranular – Lymphocytes; immune attack Monocytes (MACs); phagocytosis

Composition & Function of Blood Diapedesis – Ability of WBCs to slip through blood vessels

Composition & Function of Blood Platelets – Blood Clotting Large shaped cells Also called Thrombocytes

Blood Types A Blood – Anti-B B Blood – Anti-A AB Blood – None O – Anti-A and B

Blood Types Rh Factors – 8 Different Most common, D, occurs in 85 % of Americans (+) See pages 649 Coagulation – thickening Agglutination - clumping