Term
| cardiovascular system function |
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Definition
| supplying oxygen and nutrients to tissues and removing waste from them |
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Definition
| hollow, cone shaped; muscular pump; 14 cm long and 9 cm wide |
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| thoracic cavity; in the mediastinum under sternum; apex extends to the fifth intercoastal space |
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Definition
| encloses the heart; tough outer covering has connective fibrous tissue and inside is the epicardium |
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Definition
| surrounded by pericardium, delicate visceral pericardium; surrounds the heart;folds the back to become the parietal pericardium at the base of the heart that lines itself; houses blood and lymph capillaries a;ong with coronary arteries |
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Definition
| potential space in between the parietal and visceral percardial filled with serous fluid |
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Definition
| middle layer of heart;cardiac muscle; thickest layer |
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Definition
| smooth and made of of connective tissue and epithilium; continuous with the endothelium of major vessels joining the heart; contains Purkinje fibers |
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Term
| internal chambers of the heart |
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Definition
| two atria on top and two ventricles on bottom |
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Definition
| receive blood returning to the heart; have thin walls and ear-like auricles projecting from exterior |
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Definition
| pump blood to the body; right one only goes to lungs left to whole body |
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Definition
| divides a and v on either side |
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Term
| atrioventricular valve (3) |
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Definition
| ensures one way blood flow; have cusps to which chordae tendinae attach; right=tricuspid left=mitral |
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Term
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Definition
| attached to papillary muscles in teh inner heart wall; contract during ventricular contraction to prevent back flow through the a-v valves |
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Term
| vena cavas and coronary sinuses |
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Definition
| bring blood from body to atrium; blood is low in O, high in CO2 |
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Definition
| base of pulmonary trunk leading to lungs; prevents return of blood to right ventricle |
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Definition
| prevents backflow into left ventricle |
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Term
| rings of dense connective tissue (2) |
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Definition
| surround pulmonary trunk and aorta to provide attachments fpr heart valves and fibers; prevent dilating of tissue |
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Term
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Definition
| low O blood-->vena cava/coronary sinus-->right atrium-->tricuspid valve-->right ventricle-->pulmony valve-->pulmonary trunk and arteries-->lungs for oxygen-->pulmonary veins-->left atrium-->mitral valve-->left ventricle-->aortic valve-->aorta-->body |
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Definition
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Definition
| vibrations in heart tissues as blood rapidly changes velocity within the heart |
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Definition
| ventricles contract; a-v close |
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Definition
| ventricles relax; aortic and pulmonary valves close |
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Definition
| mass of merging fibers; atrial and ventricular |
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Definition
| force of blood against inner walls of blood vessels; rises and falls according to the cardiac cycle; determined by caridac output and periphrial resistance |
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Definition
| ventricular contraction; pressure at highest |
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Definition
| ventricle relaxation; pressure lowest |
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Definition
| surge of blood during ventricular contraction at certain points in the body |
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Term
| influences of arterial pressure |
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Definition
| heart action, blood volume, resistance to flow, blood viscosity |
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Definition
| stroke volume and heart rate(caridiac output); direct with blood pressure |
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Definition
| directly proportionate with blood pressure, varies with age, size, gender |
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Definition
| friction between blood and walls of blood vessels; direct with blood pressure (sympathetic constriction) |
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Definition
| ease of flow, greater flow resistance higher blood pressure |
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Term
| blood pressure fluctuation |
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Definition
| rises cardiac center of medulla oblongata sends parasympathetic impulses to slow it down and sympathetic to speed it up |
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