Lecture 15 biology 2

Lecture 15 biology 2 - Lecture 15: Circulatory System...

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Lecture 15: Circulatory System I. Purpose and types of Circulatory Systems II. Elements of the Circulatory System (Cardiovascular system) A. Heart B. Blood vessels C. Blood III. Diseases What does the circulatory system do? • FUNDAMENTAL CHALLENGES – Get the good stuff distributed to all cells in the body – Get the bad stuff out of body’s cells and into excretory system • Closely tied to the respiratory (or gas exchange) system in many animals (next lecture) Types of Circulatory Systems 1) —fulfills the same role as a circulatory system Occurs in very small animals: micro- organisms, small multicellular organisms -- Single celled -- Few cell layers Protist Cnidarians, Flatworms
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Types of Circulatory Systems 2) Occurs in arthropods and most molluscs Fluid called because blood and interstitial liquid (liquid in body cavity) are not separated. Types of Circulatory Systems 2) Open Circulatory System Bathes the organs directly and is not confined to vessels Several small hearts help to move the hemolymph around in the body Advantages: -- no extensive blood vessels, etc. -- no high pressure system Types of Circulatory Systems 3) Circulatory System • Earthworms, some molluscs, vertebrates • Blood contained in extensive vessel networks
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Types of Circulatory Systems • 3) Closed Circulatory System • Capillaries deliver oxygen, nutrients to cells. • Advantages: create
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Lecture 15 biology 2 - Lecture 15: Circulatory System...

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