Chapter 32 Circulation & Lymphatic System

Chapter 32 Circulation & Lymphatic System - Chapter...

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Chapter 32: Circulation
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Functions of the Circulatory System Transport O2 , CO2 , energy sources, hormones, waste products. Distribute nutrients to body cells Regulates body temp. Heals wounds
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The Circulatory System Three parts : Blood Blood vessels Heart
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Open vs. Closed Animals have two types of circulatory systems Which do we have? Which one does this grasshopper have?
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Open Found in many invertebrates ( spiders, insects, crustaceans, mollusks ) One or more hearts , blood vessels and a hemocoel ( open cavity ) Organs are directly bathed in blood Inefficient
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Closed Found in some inverts and all vertebrates Blood confined to a continuous series of vessels Faster, more efficient, higher blood pressure
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Heart (the pump) Made of muscular chambers built to contract Atria collect blood, send it to ventricles Ventricles contract, sending blood out to the body
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Fish were the first vertebrates to evolve hearts Simple hearts: Two-chambers: 1 atrium, 1 ventricle
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Amphibians and Reptiles Three- chambered heart evolved Two atria and one ventricle
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Mammals and Birds 4 Chambered Heart . They have a higher metabolic demand
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Question 32-5
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right atrium pulmonary veins (from left lung) pulmonary artery (to left lung) atrioventricula r valve semilunar valves left ventricle atrioventricular valve right ventricle inferior vena cava descending aorta (to lower body) pulmonary veins (from right lung) pulmonary artery (to right lung) superior vena cava aorta left atrium
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Human Hearts Atria pump to ventricles
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Ventricles pump blood out to body Arteries go away from the heart, Veins go to heart Blood gets oxygen from lungs
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The Human Heart Considered two separate pumps
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Pump 1: Right Deoxygenated blood Right atrium receives blood from body from a large vein ( vena cava ), The atrium contracts
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Pump 1:Right Pushes blood to the right ventricle , which contracts Pushes blood to lungs through pulmonary artery
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Oxygenated blood Left atrium receives blood from the lungs (via the pulmonary veins ), and contracts Blood pushed to left ventricle , which contracts Blood sent to aorta ( body’s major artery ) and back to body Pump 2: Left
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