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Blood Vessels and Circulation

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

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Blood Vessels and Circulation

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  1. Blood Vessels and Circulation

  2. Functions of Circulation • Carries Blood • Exchange Nutrients, waste products, and gases. • Transportation • Regulates Blood Pressure • Directs Blood Flow

  3. Blood Vessels • Types 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)

  4. Blood Vessel Structure • Blood Vessels contain 3 major layers called Tunics • Tunic intima • Tunic Media • Tunic Adventitia

  5. Veins, Arteries and Capillaries Structures

  6. Arteries • Elastic Arteries: Thickest walls and largest diameter located near the heart • Muscular Arteries: Contain more smooth muscle and can regulate blood flow • Vasoconstriction= Contraction of smooth muscle (decrease diameter) • Vasodilation= Relaxation of blood vessels (increase diameter) • Arterioles: Thinnest walls and smallest diameter located near capillaries

  7. Capillaries • Capillaries: Site where gas exchange occurs between oxygenated blood and deoxygenated blood • Precapillary Sphincters: Regulates blood flow through the capillaries

  8. Veins • Venules: 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

  9. Aging of the Arteries • As 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

  10. Systemic Pulmonary Circulation • Systemic 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

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