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CHAPTER 30 Transporting Materials All living things obtain essential materials from env. In order to live. Complex animals have circ. Systems to… transport O2, CO2, food & hormones to & from cells of body maintain body temp. help fight disease Blood: A Liquid Tissue Only liquid tissue PLASMA – material making blood a liquid rbc – responsible for carrying O2 throughout body. - carry CO2 away. HEMOGLOBIN – Protein that gives blood red color. - Helps rbc carry O2 ANEMIA – Condition of O2 shortage in blood. wbc – “Mobile Army” – defends body from bacteria, viruses, other foreign cells. MACROPHAGE – scavenge worn out or dead cells Follow chemical trail to infections, etc. Find infection by counting wbc PLATELETS – essential for clotting(p.653) Carry blood from heart to organs and back to heart. Flexible walls…Why? ARTERIES – Carry blood away from heart - O2 rich blood - Elastic & muscular walls VEINS – Return blood to heart - O2 poor blood - Thin & slightly elastic CAPILLARIES – Walls = one cell (Diffusion) - O2 & Nutrients out. • CO2 & Waste in. Blood Types Determined by presence or absence of specific marker proteins on surface of rbc. A, B, AB, O (add table 31-1 to your notes) Excess fluids & proteins in body returned to blood.