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Final Review

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Question
Answer
Why do large organisms require a circulatory system?   They cannot rely on diffusion b/c most of their cells are not in direct contact with the environment. Substances made in one part of the organism may be needed in another.  
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Closed circulatory system   blood is pumped thru a system of vessels.  
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3 components of circulatory system   heart, blood vessels, blood  
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Pericardium   Sac of tissue that encloses and protects the heart.  
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Myocardium   thick layer of muscle in the walls of the heart. It contracts to pump the blood.  
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Atrium   upper chamber of heart  
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Ventricle   lower chamber of heart  
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Septum   divides the right side of the heart from the left. prevents mixing of oxygen poor & rich blood.  
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Pulmonary circulation   right side, from heart to lungs.  
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Systemic circulation   left side, heart to rest of body.  
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