Bio Chapter 28

Bio Chapter 28 - Chapter 28: Circulation Circulatory System...

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Chapter 28: Circulation
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Circulatory System Basics 3 major parts Fluid: transport medium (i.e. blood) Channels- conduct blood throughout body (i.e. blood vessels) Pump: drives blood flow (i.e. heart)
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Animals Have Two Types of Circulatory Systems Open circulatory system: space within body cavity (hemocoel) Found in arthropods and most mollusks openings in hearts hearts hemocoel
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Animals Have Two Types of Circulatory Systems Closed circulatory system:confined blood in continuous vascular network with a pumping heart Found in some invertebrates and all vertebrates dorsal vessel smaller vessels ventral vessel hearts
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The Vertebrate Circulatory System Has Many Diverse Functions 1. Transport of O2 and CO2 2. Distribution of nutrients 3. Transport of waste 4. Distribution of hormones 5. Regulation of body temperature 6. Protection of body against blood loss and disease
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Structure and Evolution of the Vertebrate Heart Vertebrate hearts have muscular chambers called atria and ventricles Atria collect blood from body Contract and deposit blood in ventricles Ventricles contract and discharge blood to body Hearts can have 2, 3, or 4 chambers
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Structure and Evolution of the Vertebrate Heart Two chambered hearts Earliest vertebrate hearts with one atrium and one ventricle Ex. fish heart gill capillaries body capillaries ventricle atrium
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Structure and Evolution of the Vertebrate Heart 3 chambered heart have 2 atria and 1 ventricle ex: amphibian and most reptile hearts lung capillaries body capillaries ventricle atria
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Structure and Evolution of the Vertebrate Heart 4 chambered heart Most advanced type Have 2 atria and 2 ventricles Separation of o2-rich and o2 poor blood maximizes o2 levels in blood Ex. bird and mammal hearts lung capillaries body capillaries ventricles atria
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Human Heart Function Two types of blood vessels connect to heart chambers Veins -carry blood to atria Arteries- carry blood away from ventricles
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right atrium pulmonary veins (from left lung) pulmonary artery (to left lung) atrioventricular 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 Heart Function Made of 2 separate pumps: Right pumps: made of right atrium and ventricle Left pump: made of left atrium and ventricle
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Human Heart Function Right pump Right atrium receives O2-poor blood from body by superior and inferior vena cava Right ventricle ejects O2 poor blood into pulmonary arteries to be oxygenated by lungs Left pump Left atrium receives O2 rich blood from lungs by pulmonary veins Left ventricle ejects O2 rich blood into Aorta to be distributed to body tissues
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The Cardiac Cycle Heart beats in a coordinate fashion: Both atria contract and pump blood into
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This note was uploaded on 10/07/2011 for the course BIOL 1002 taught by Professor Pomarico during the Spring '08 term at LSU.

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Bio Chapter 28 - Chapter 28: Circulation Circulatory System...

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