Blood Vessels and Circulation
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Transcript of Blood Vessels and Circulation
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Blood Vessels and Circulation
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Functions of CirculationCarries Blood Exchange Nutrients, waste products, and
gases. TransportationRegulates Blood PressureDirects Blood Flow
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Blood VesselsTypes of Blood Vessels
Arteries Capillaries Veins
Arteries: Bring blood from the heart to other parts of the body (elastic arteries, muscular arteries, arterioles)
Capillaries: Network of very small blood vessels Veins: Bring blood from parts of the body to the heart
(Venules, small veins, medium-sized veins, large veins)
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Blood Vessel StructureBlood Vessels contain 3 major layers called
TunicsTunic intimaTunic MediaTunic Adventitia
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Veins, Arteries and Capillaries Structures
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ArteriesElastic Arteries: Thickest walls and largest
diameter located near the heartMuscular Arteries: Contain more smooth
muscle and can regulate blood flowVasoconstriction= Contraction of smooth
muscle (decrease diameter) Vasodilation= Relaxation of blood vessels
(increase diameter)Arterioles: Thinnest walls and smallest diameter
located near capillaries
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CapillariesCapillaries: Site where gas exchange occurs
between oxygenated blood and deoxygenated blood
Precapillary Sphincters: Regulates blood flow through the capillaries
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VeinsVenules: Thinnest walls and
smallest diameter located near capillaries
Medium/Small Sized Veins: Larger diameter and thicker wall
Large Veins: Thickest wall and largest diameter veins with diameters greater than 2 mm contain valves, which allow blood to flow in one direction
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Aging of the ArteriesAs you get older the walls of you elastic
arteries become less elastic and become stiffer. (Arteriosclerosis)
Atherosclerosis: A specific type of arteriosclerosis excess build up plaque
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Systemic Pulmonary CirculationSystemic Circulation: Brings oxygenated
blood from the lungs to the heart to the rest of the body
Pulmonary Circulation: Brings Deoxygenated from the body to the heart then to the lungs