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BIO 202 – HUMAN ANATOMY AND PHYSIOLOGY II CHAPTER 18:BLOOD VESSELS AND CIRCULATION- CLASS LECTURE NOTES VISUAL A & P, MARTINI MODULE 18.1 INTRODUCTION: THE HEART PUMPS BLOOD THROUGH A NETWORK OF BLOOD VESSELS BLOOD VESSELS CONDUCT BLOOD BETWEEN HEART AND PERIPHERAL TISSUES TWO CIRCUITS - Each circuit begins and ends with heart 1.____________ circuit (to and from lungs) 2. ____________ circuit (to and from rest of body) SPECIFIC VESSELS 1. ____________ (transport blood away from heart) 2. ____________ (transport blood to the heart) 3. ____________ ( simple squamous epithelium form walls) exchange of substances between blood and tissues Interconnect smallest arteries and smallest veins GENERAL CIRCULATION PATHWAY THROUGH CIRCUITS 1. Right atrium ( entry chamber ) from systemic circuit to right ventricle, to 45
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pulmonary circuit 2. Pulmonary circuit - Pulmonary arteries to p. capillaries to p. veins 3. Left atrium from pulmonary circuit to left ventricle, to systemic circuit 4. Systemic circuit -Systemic arteries to sys. capillaries to systemic veins MODULE 18.2 STRUCTURE OF ARTERIES AND VEINS 1. BOTH ARTERIES AND VEINS HAVE THREE LAYERS 1) TUNICA ____________ (tunica interna) Innermost layer Endothelial cells with connective tissue with elastic fibers In arteries, outer margin has layer of elastic fibers (internal elastic membrane) 2) TUNICA ____________ Middle layer Contains concentric sheets of smooth muscle
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