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Blood Vessels of the Cardiovascular System

Blood Vessels of the Cardiovascular System. Blood Vessels. Closed circuit of tubes that carry blood between tissue and the heart. Arteries and arterioles Carries blood away from ventricles Capillaries Exchange of substances with cells Venules and veins Returns blood to atria.

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Blood Vessels of the Cardiovascular System

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  1. Blood Vessels of the Cardiovascular System

  2. Blood Vessels • Closed circuit of tubes that carry blood between tissue and the heart. • Arteries and arterioles • Carries blood away from ventricles • Capillaries • Exchange of substances with cells • Venules and veins • Returns blood to atria

  3. Circulation pathways

  4. Anatomy of Vessels

  5. Artery with thick wall Connective tissue Muscle layer Endothelium

  6. ARTERY and VEIN Lumen

  7. Blood Pressure • Systolic • Pressure exerted on arteries by contraction of ventricles • Measured in arteries • Not found in capillaries • Diastolic • Pressure in arteries during relaxation of ventricles • Measured in arteries • Not found in capillaries

  8. Blood Pressure in Vessels

  9. Factors that influence blood pressure • Cardiac output • Increase HR, SV = rise in blood pressure • Blood volume • Greater volume of blood = rise in BP • Peripheral resistance of arterioles • Vasoconstriction = rise in BP • Vasodilation = drop in BP • Viscosity of blood • Thick blood = rise in BP

  10. Regulating blood pressure • Sympathetic nerve stimulation of arterioles • Constriction of vessels • Raises blood pressure • Adrenal gland stimulation • Constriction of vessels • Raises blood pressure

  11. Smaller Artery and Vein

  12. Small arteriole

  13. Capillary bed where exchanges take place

  14. No chance of exchanges through artery wall!

  15. Coronary arteries

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