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Biology Chapter 37

Final Review

QuestionAnswer
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.
Closed circulatory system blood is pumped thru a system of vessels.
3 components of circulatory system heart, blood vessels, blood
Pericardium Sac of tissue that encloses and protects the heart.
Myocardium thick layer of muscle in the walls of the heart. It contracts to pump the blood.
Atrium upper chamber of heart
Ventricle lower chamber of heart
Septum divides the right side of the heart from the left. prevents mixing of oxygen poor & rich blood.
Pulmonary circulation right side, from heart to lungs.
Systemic circulation left side, heart to rest of body.
Created by: numchuckskillz
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