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Chapter 20 Outline

Chapter 20 Outline - Chapter 20 The Heart The Organization...

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Chapter 20- The Heart The Organization of the Cardiovascular System a. Pulmonary Circuit- blood travels from the heart to the lungs and back to the heart. It then becomes red colored. It then comes back to the left side of the heart. b. Systemic Circuit- blood travels from the heart to the body tissues and back to the heart. It then turns from red to blue. c. Arteries- (blood vessels) carry blood away from the heart and mostly carry oxygenated (High O 2 and low CO 2) blood. Almost always carry oxygenated blood (red color). d. Veins- always carry blood toward the heart and mostly carry deoxygenated (blue color) (Low O 2 and high CO 2) blood. e. Capillaries- the smallest blood vessels. They connect arteries to veins. Anatomy of the Heart a. Apex- the pointed tip of the heart. b. Mediastinum- the space between the lungs. c. Parietal pericardium - the sac that encloses the heart. d. Visceral pericardium- the layer of tissue that adheres to the heart muscle. e. Pericardial fluid- contained in the pericardial cavity. f. Heart Wall 1 . epicardium- same as visceral pericardium, a layer that sticks to the outside of the heart. 2. myocardium- the cardiac muscle tissue, the big muscle layer that makes up the outer layer of the heart. 1. cardiac muscle tissue 3. endocardium- (inside ) lines the chamber of the heart. g. Internal Anatomy of the Heart 1. right and left atria - collect the blood from the lungs and the body. 2. interatrial septum - separates the left and the right atria.
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