CardiovascularSystem_BloodVessels_Exam3.docx - Blood Vessels Systemic Circulation versus Pulmonary Circulation o Systemic Circulation Blood travel from

CardiovascularSystem_BloodVessels_Exam3.docx - Blood...

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Blood Vessels Systemic Circulation versus Pulmonary Circulation o Systemic Circulation: Blood travel from L Ventricle to R Atrium/ Blood travels through L Ventricle > Arteries > Arterials > Capillaries > collects into Venules > Veins/ Superior (upper extremities) or Inferior (lower extremities) Vena Cava > R Atrial Chamber o Pulmonary Circulation: Blood travel from R Ventricle to R Atrium/ R Ventricle > Pulmonary Trunk > Pulmonary Arteries (2 coming from Left Lung and Right Lung) > Lungs > Pulmonary Arterials > Pulmonary Capillaries > collect into Pulmonary Venules > Pulmonary Veins (2 Left and 2 Right) > L Atrium o 3 Functional Correlates of Vascular Components: Velocity of blood flow through Vascular Segment varies with collective cross- sectional area of that segment BP decreases in consecutive Vascular Segments 1. Skeletal Muscle Pump o Vein: contains valves o When contraction occurs, skeletal muscle shortens causing the body to bulge and squeeze the vein between the muscles/Increase in BP/ valve closest to heart will open to eject blood Varicose Veins occur when valves do not properly close and blood leaks back down the veins Most of circulating blood volume is found in veins that surround organs Anatomy of Vessels: walls continue to get thinner o Arteries and Arterioles: rounded cross section o Veins and Venules: collapsed cross section/ Capacitance Vessels Large Artery (Aorta): 1. Tunica Interna: o Layer of Endothelium: 1 layer simple squamous o Basement Membrane located under Endothelium o Beneath Basement Membrane is a thin layer of Collagenous Tissue 2. Tunica Media: o Layer of Smooth Muscle Tissue and Elastic Fibers 3. Tunica Extrema: o Outer layer made of Collagen Fibers o Vaso Vasorum: small blood vessels that invade larger artery Medium Artery: 1. Tunica Interna: o Layer of Endothelium o Basement Membrane beneath Endothelium o Internal Elastic Lamina located around the Lamina 2. Tunica Media: o Thick Layer of Smooth Muscle Tissue o External Elastic Lamina 3. Tunica Externa:
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o Layer of Collagen Fibers Arterioles: 1. Tunica Interna: o Layer of Endothelium o Basement Membrane beneath Endothelium 2. Tunica Media: o Layer of Smooth Muscle Tissue/ 2-6 layers 3. Tunica Externa: o Very thin layer of Collagen Fibers Capillary: Thinnest wall 1. Tunica Interna: o Layer of Endothelium o Basement Membrane located beneath Endothelium 2. Tunica Media: o Does not exist 3. Tunica Externa: o Does not exist 4. Classification: o Continuous Capillary: has a continuous Basement Membrane/ in lung, muscle, nervous tissue, exocrine glands o Fenestrate Capillary: pores located in wall/ easy to move things
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  • Spring '14
  • MarkS.Kosco

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