32 Circulation student 2007

32 Circulation student 2007 - Chapter 32 Circulation 32.1...

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Chapter 32 Circulation 32.1 What Are the Major Features and Functions of Circulatory Systems? p. 650 32.2 How Does the Vertebrate Heart Work? p. 651 32.3 What Is Blood? p. 657 32.4 What Are the Types and Functions of Blood Vessels? p. 661 32.5 How Does the Lymphatic System Work with the Circulatory System? p. 663
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Section 32.1 Outline 32.1 What Are the Major Features and Functions of Circulatory Systems? Animals Have Two Types of Circulatory Systems The Vertebrate Circulatory System Has Many Diverse Functions
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Circulatory System Basics Three major parts Blood Blood vessels Heart
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Two Types of Systems Open circulatory system : space within the body cavity ( hemocoel ) Found in arthropods and most mollusks
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Two Types of Systems Closed circulatory system: blood confined within continuous vascular network with a pumping heart Found in some invertebrates and all vertebrates
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Diverse Functions 1. Transport of O 2 and CO 2 2. Distribution of nutrients 3. Transport of waste 4. Distribution of hormones 5. Regulation of body temperature 6. Prevent blood loss 6. Protect against disease
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Section 32.2 Outline 32.2 How Does the Vertebrate Heart Work? Increasingly Complex and Efficient Hearts Have Arisen During Vertebrate Evolution The Vertebrate Heart Consists of Muscular Chambers
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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
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Evolution of the Vertebrate Heart Two chambered hearts Earliest vertebrate hearts with one atrium and one ventricle Example: fish hearts
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Evolution of the Vertebrate Heart Three chambered hearts Have two atria and one ventricle Examples: amphibian and most reptile hearts
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Evolution of the Vertebrate Heart Four chambered hearts Most advanced Have two atria and two ventricles – Separation of O 2 -rich and O 2 -poor blood maximizes O 2 levels in blood Examples: bird and mammal hearts
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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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Human Heart Function Made of two separate pumps Right pump: made of right atrium and right ventricle Left pump: made of left atrium and left ventricle
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Human Heart Function Right pump – Right atrium receives O 2 -poor blood from body by superior and inferior vena cavae – Right ventricle ejects O 2 -poor blood into pulmonary arteries to be oxygenated by lungs
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Human Heart Function Left pump – Left atrium receives O 2 -rich blood from lungs by pulmonary veins – Left ventricle ejects O 2 -rich blood into aorta to be distributed to body tissues
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Human Heart Function Pumps separated by ventricular septum
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Cardiac Muscle The heart is composed of cardiac muscle tissue Cardiac muscle cells are Small, branched, and striated Linked to one another via intercalated discs containing gap junctions
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This note was uploaded on 04/07/2008 for the course BIO 101 taught by Professor Ward during the Fall '07 term at Shepherd.

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32 Circulation student 2007 - Chapter 32 Circulation 32.1...

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