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Compare and Contrast Blood Vessels Blood Vessels---

Compare and Contrast Blood Vessels Blood Vessels---. Canals or tubes of various sizes in your body in which blood travels to transport substances to each cell of your body— Arteries---- Capil laries---- Veins. Arteries. Arteries are the blood vessels that

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Compare and Contrast Blood Vessels Blood Vessels---

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  1. Compare and Contrast Blood Vessels Blood Vessels--- Canals or tubes of various sizes in your body in which blood travels to transport substances to each cell of your body— Arteries---- Capillaries---- Veins

  2. Arteries • Arteries are the blood vessels that carry bright red, oxygenated blood away from the heart. (Except the pulmonary artery leaving R side of heart) • Left Ventricle pumps blood out of the heart into the largest artery in your body----the aorta • Coronary arteries are the first branch taking blood to the heart. Other branches carry blood to all parts of the body. • Thick walls---3 layers---outer connective tissue/middle smooth muscle---Inner Epithelial---Strong and Flexible---under enormous pressure Pulse---alternating expansion and relaxation of the artery wall as the ventricle of the heart contracts and pushes blood

  3. Capillaries • Connect arteries to veins • Walls are one cell thick • Red Blood vessels line up single file to • pass through/Most numerous • Site of Diffusion of materials needed • by cells and the removal of waste • products from cells----Drop off oxygen • And pick up carbon dioxide

  4. Veins • Carry deoxygenated blood back to the • Heart---blood flows from capillaries into • Small veins that flow into bigger veins as • Blood moves back to the heart. • Largest Veins are at • the heart entering • the right atrium. • Superior Vena Cava • Bringing blood from • upper part of body • Back to heart. Inferior • Vena Cava bringing • Blood from lower • part of body

  5. Walls of veins have three layers • like arteries, but are much thinner. • Have muscle in the middle layer. • Little pushing force from heart • In veins. • Blood moved in veins with help of • Skeletal Muscles---contractions of • Muscles help move blood along • Breathing movement--- • Squeeze against veins in • Moving blood • Valves in veins----keep • Blood from flowing • Backwards---work • against gravity

  6. Blood Pressure • Remember: The circulatory system is • A closed circuit of vessels under great • pressure. Pressure---force that something exerts over a given area • Blood flows through the blood vessels. • The force that blood exerts against • the walls of the vessels is blood pressure • Force is caused by the pumping action • of the ventricles of the heart. • Blood flowing near the heart has greatest • Pressure. Blood farthest from heart has • Least pressure.

  7. Measuring Blood Pressure Sphygmomanometer Sfigmohmuh NAHM uh tur • Blood pressure is measured • with a cuff wrapped around the upper • arm. • Air pumped into cuff until blood flow • In artery stopped. As pressure released • listen to pulse and record 2 numbers. • First Number (upper number) measure of BP • while the ventricles contract and pump blood • into arteries. • Second number (lower number) measure • the BP while ventricles relax . • Two numbers expressed as a fraction. • Contraction over relaxation. Measured in • MM of mercury.

  8. High Blood Pressure Below 120 Below 80 Normal 120-139 80-89 Pre-hypertension 140-159 90-99 Stage 1 160 or more 100 or more Stage 1

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