Biol 216 9 Circulatory System 1-32.pdf

Biol 216 9 Circulatory System 1-32.pdf - Power Point 6 1...

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5/24/17 1 Power Point 6 5/24/17 1 Learning Goals 1. Understand the difference between, and give examples of, open and closed circulatory systems. 2. Categorize blood components and their function. 3. Trace the routes of blood flow inthe human cardiovascular system. 4. Identify and compare and contrast key blood vessels. 5. Describe the anatomyof the heart. 5/24/17 2
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5/24/17 2 Learning goals 6. Explain each portion of the cardiac cycle. 7. Understand how and why a heart beats, including the molecular basis for action potentials in the SA node and myocardium and electrical conductivity. 8. Explain the biological basis of each portion of an EKG 9. Discuss the factors that cause blood to exist under different pressures. 10.Describe the factors involved (neurotransmitters, neurohormones) and interplay of the parasympathetic and sympathetic regulation of the circulatory system. 5/24/17 3 Animal Circulatory Systems: Key Points Animal circulatory systems share basic elements Most invertebrates have open circulatory systems Some invertebrates and all vertebrates have closed circulatory systems Vertebrate circulatory systems have evolved from single to double blood circuits 5/24/17 4
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5/24/17 3 Basic components ofCirculatory systems 1 . Circulating fluid – Blood or hemolymph 2. Pump to provide pressure Tubular Hearts Chambered Hearts 3. Blood vessels or channels for transport over distance 4. Area for exchange of gases (O2 CO2) nutrients and waste Capillaries or Sinuses 5/24/17 5 Invertebrate Systems Simple invertebrates(sponges, cnidarians, and flatworms); use cilia, flagella. Pick up O2 and nutrients, release waste, CO2. Diffusion across single cell (or a few cell) layers 5/24/17 6
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5/24/17 4 Larger Animals More complex systems- Layers of multiple cells -tissues, organs that are deep in the body so substances cannot be exchanged with the environment by simple diffusion Muscular heartpumps specialized fluid (such as blood) through tubular vessels Blood Carries O 2 and nutrients to body tissues Carries away CO 2 (exits via respiration) and wastes (removed in kidneys, excreted to outside body) 5/24/17 7
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