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Chapter20BloodVesselsMarieb - Key Concepts Describe the...

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Describe the histological similarities and differences of the blood vessels Explain the pattern and names of the major arteries and veins of the pulmonary & systemic circulations Describe the circulatory changes that occur at birth. Key Concepts : Developed by John Gallagher, MS, DVM
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Pulmonary Circuit: From the “Right Heart” to the Lungs Systemic Circuit: From the “Left Heart” to Everywhere Else 65 -70% in veins (= blood reservoir); lumen is larger than in corresponding arteries 30-35% in heart, arteries and capillaries N.B. The chambers pump the same VOLUME, approx 35 cc.
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1. Tunica interna or intima (endothelium + c.t.) 2. Tunica media (muscle + c.t.) Much more smooth muscle in arteries 3. Tunica externa or adventitia (thick layer of c.t.) 4. Vasa vasorum (p 588 )
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