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Blood Vessels and Circulation. Functions of Circulation. Carries Blood Exchange Nutrients, waste products, and gases. Transportation Regulates Blood Pressure Directs Blood Flow. Blood Vessels. Types of Blood Vessels Arteries Capillaries Veins - PowerPoint PPT Presentation
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Blood Vessels and Circulation
Functions of CirculationCarries Blood Exchange Nutrients, waste products, and
gases. TransportationRegulates Blood PressureDirects Blood Flow
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)
Blood Vessel StructureBlood Vessels contain 3 major layers called
TunicsTunic intimaTunic MediaTunic Adventitia
Veins, Arteries and Capillaries Structures
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
CapillariesCapillaries: Site where gas exchange occurs
between oxygenated blood and deoxygenated blood
Precapillary Sphincters: Regulates blood flow through the capillaries
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
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
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