1104 chapter 12

1104 chapter 12 - 1104 chapter 12 Circulatory System The...

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1104 chapter 12 Circulatory System The cardiovascular system consists of 1. Blood 2. Blood vessels 3. hear Blood Vessels: The circulatory system has three types of blood vessels 1. The arteries and arterioles 2. the capillaries 3. the veins and venules Arteries and arterioles: 1. carry blood away from heart 2. have thick but flexible walls (so that they can carry high-pressured blood) 3. arterioles are smaller arteries Capillaries 1. arterioles branch into capillaries 2. capillaries are microscopic very narrow and have only one cell thick wall 3. network of capillaries (capillary bed) is found throughout the body 4. capillaries are important part of circulatory system, because exchange of substances occurs through capillaries 5. oxygen and nutrients diffuse out of the capillaries into body fluids, waste and carbon dioxide diffuse into capillaries Veins and venules : 1. Take blood form the capillary bed to heart 2. blood in capillaries venules veoms 3. the walls of veins are thinner 4. large veins have valves to stop backflow of blood The heart: 1. The heart is four chambered, cone-shaped, muscular organ located between the lungs behind sternum 2. the major portion is myocardium with consists of cardiac muscles tightly joined together 3. the heart lies inside pericardium, a thick membranous sac in lubricating liquid 4. the inner surface of heart is endocardium 5. Internally septum, a wall separates the heart into lef and right side 6. the four chambers in heart include-two upper, thin walled atria (atrium) and two lower, thick walled ventricles 7. the valves that lie between atrium and ventricles are called atrio ventricular valves (tricuspid 3 flaps) have fibrous strings called chordae tendinae.
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8. Semi lunar valves are of two types. Pulmonary semilunar valve lies between right ventricle and pulmonary trunk The aortic semilunar vale lies between left ventricle and aorta Taking blood through the heart 1. The superior (anterior) vena cava and inferior (posterior) vena cava, both carry deoxygeneated blood (low in O2 and high in Co2) from t he body to the right atrium 2. the right atrium sends the blood to right ventricle through atrioventricular valve
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This note was uploaded on 06/28/2011 for the course BIOL 1101 taught by Professor Staff during the Fall '10 term at Kennesaw.

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1104 chapter 12 - 1104 chapter 12 Circulatory System The...

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