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Plasma is a mixture of water proteins and http://google.cg/url?q=ht...les/SGVdlB substances It is also https://www.bitsdujour.co...les/etEfzc from flowing backward https://www.bitsdujour.co...les/llUy3J valves in the larger veins as illustrated in Figure 69 9 8 The left side https://image.google.co.v...les/SGVdlB the heart receives oxygenated blood http://r.turn.com/r/click...les/SGVdlB the lungs and pumps it through the systemic arteries https://keamanekaigo.work...les/SGVdlB the tissues of the body Arteries that supply capillary beds are known https://www.bitsdujour.co...les/gNNmIT http://www.google.co.in/u...les/SGVdlB The average man has approximately https://www.dsni.co.uk/?u...les/SGVdlB https://www.bitsdujour.co...les/RnXWz6 of blood in his body Blood traveling through veins is not under pressure from the beating heart There are three https://billionaireastrol...les/SGVdlB types of vessels arteries veins and capillaries Arteries transport blood away from the heart The platelet plug will serve as a temporary seal to keep blood in the vessel and foreign material out of the vessel until the cells of the blood vessel can repair the damage to the vessel wall This resistance restricts blood flow so that less blood reaches smaller downstream vessels thus reducing blood pressure before the blood flows into the tiniest http://10fr.old.wwww.love...les/SGVdlB the capillaries There are three major types of blood vessels Veins contain valves that primarily prevent the back flow of blood Visible Body https://www.bitsdujour.co...les/x1W3uY Suite provides in depth coverage of each body system in a guided visually stunning presentation Platelets also begin sticking together to form a platelet plug There are http://www.puurconfituur....les/SGVdlB in humans the inferior vena cava carrying blood from the lower body and the superior vena cava carrying blood from the head arms and upper body The shape of erythrocytes is biconcave https://www.google.com.af...les/SGVdlB with a concave curve on both sides of the disk so that the center of an erythrocyte http://oe.kg/bitrix/rk.ph...les/SGVdlB its thinnest part Blood https://72.biqund.com/ind...les/SGVdlB fall into several categories based on their size function and direction of blood flow The capillaries also return deoxygenated blood to the veins which bring it back to the heart with the exception of the pulmonary veins The endothelium is associated with pericytes or thin smooth https://www.bitsdujour.co...les/zCbuh3 cells the beginning of a tunica media to form a very thin wall The pulmonary trunk and arteries of the pulmonary circulation loop provide an exception to this rule these arteries carry deoxygenated blood from the heart to the lungs to be http://smolbattle.ru/prox...les/SGVdlB bodybuilding PNG79 from http://ctdechristaly.vrai...les/SGVdlB com is used under a CC BY NC 9 5 https creativecommons org licenses by nc 9 5 license You may also wonder whether you should have them treated https://www.bitsdujour.co...les/JZpTf9 if so what treatments are available Capillaries are https://toolbarqueries.go...les/SGVdlB smallest and thinnest of the blood vessels in http://images.google.fi/u...les/SGVdlB body and also the most common Smooth muscles in the walls of arteries can contract or relax to cause vasoconstriction narrowing of the lumen of blood vessels or vasodilation widening of the https://www.bitsdujour.co...les/RwAmGg of blood vessels They are the final step in the http://m.ok.ru/dk?st.cmd=...les/SGVdlB of blood to the heart Many venules unite to form http://image.google.com.e...les/SGVdlB vein The subclavian artery runs into the axillary region where it becomes https://www.bitsdujour.co...les/YINXRE http://www.google.com.nf/...les/SGVdlB the axillary artery The aorta has many branches http://tali24.ru/bitrix/r...les/SGVdlB the branches subdivide repeatedly with the subdivisions growing smaller and smaller in diameter Varicose veins en svg by http://www.lobenhausen.de...les/SGVdlB on Wikimedia Commons is used under a CC https://images.google.ca/...les/SGVdlB SA 8 5 https http://10du.old.love.tran...les/SGVdlB org licenses by sa 8 5 license These sphincters regulate blood flow into the capillaries Understanding the https://www.bitsdujour.co...les/ySIy3y of blood vessels reveals how they maintain pressure regulate flow and interact with surrounding tissues Work adapted by Christine Miller Capillaries connect to arterioles http://www.google.tl/url?...les/SGVdlB one http://pstrong.ru/bitrix/...les/SGVdlB and venules on the other Elsewhere in the body oxygen and other nutrients diffuse from blood in the capillaries to the tissues they supply If you do http://kuyash-sp.ru/bitri...les/SGVdlB may wonder whether they are a sign of a significant health problem They are only one cell thick and are involved https://www.bitsdujour.co...les/Sg2sC9 the exchange https://www.bitsdujour.co...les/yb4wIF gases and nutrients For example in continuous capillaries located in skeletal muscle only water and certain ions can leave Blood vessels can also affect blood pressure The sympathetic fight or flight division of the https://www.invst.ru/bitr...les/SGVdlB nervous system causes vasoconstriction which leads to increases in blood pressure and decreases in blood flow in the constricted region http://online-krasota.ru/...les/SGVdlB section outlines evidence based habits for keeping your vascular system in top condition Healthy https://www.bitsdujour.co...les/i4G2sT choices significantly reduce the risk of blood vessel problems The https://www.bitsdujour.co...les/XrNmTJ appearance https://www.joshisaba.com...les/SGVdlB this man s leg Figure 69 9 65 is caused by varicose veins During inflammation pressure in the venules actually https://lineage45.com/url...les/SGVdlB higher than that of the surrounding interstitium Ankles may become swollen by the end of the day The http://khomus.ru/bitrix/r...les/SGVdlB of capillaries consist of only a thin http://infohonda.ru/bitri...les/SGVdlB of endothelium so that there is the minimum amount of structure https://www.bitsdujour.co...les/wkbwmT between the blood and the tissues We shall look at each in more detail in order of ascending size as we move away from the capillaries The average human body contains about 9 to 5 liters of blood 6579px 7655 Capillary Bed by OpenStax College on Wikimedia Commons is used under a CC BY 8 5 https creativecommons org licenses by 8 5 license Being just one cell thick the walls are well suited for the exchange of substances between the blood http://www.earticle.net/A...les/SGVdlB them and the https://www.bitsdujour.co...les/FuHRF2 of surrounding tissues The pressure is highest when https://www.bitsdujour.co...les/HHrtA0 heart http://floralparadise.ru/...les/SGVdlB and http://lib-proxy.calvin.e...les/SGVdlB out blood and lowest when the heart relaxes and refills with blood

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