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10 Lymphatic Circulation

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Lymphatic Circulation THE “OTHER” CIRCULATION 1 Function of Lymphatic Circulation The lymphatic system consists of a fluid called lymph flowing within lymphatic vessels The lymphatic circulation functions to: ◦ ◦ ◦ ◦ drain interstitial fluid return leaked plasma proteins to the blood transport dietary fats protect against invasion by nonspecific defenses and specific immune responses. PRINCIPLES OF HUMAN ANATOMY AND PHYSIOLOGY, 11E 2 Lymphatic Circulation Lymphatic vessels lymph capillaries draining Interstitial fluid, thus forming lymph. Lymph capillaries merge to form larger vessels, called lymphatic vessels, Which convey lymph into and out of structures called lymph nodes Eventually draining to Lymphatic Ducts Which drain into the subclavian veins PRINCIPLES OF HUMAN ANATOMY AND PHYSIOLOGY, 11E 3 PRINCIPLES OF HUMAN ANATOMY AND PHYSIOLOGY, 11E 4 Lymphatic Capillaries Circulatory Lymphatic capillaries ◦ Features: Digestive Lymphatic Capillaries A lymphatic capillary in the villus of the small intestine is the lacteal. PRINCIPLES OF HUMAN ANATOMY AND PHYSIOLOGY, 11E 5 Lymphatic Capillaries Found throughout the body except in Avascular tissue (cartilage, epidermis & cornea) Structure is designed to let tissue fluid in, but not out ◦ anchoring filaments keep tube from collapsing under outside pressure ◦ overlapping endothelial cells open when tissue pressure is high (one-way valve) PRINCIPLES OF HUMAN ANATOMY AND PHYSIOLOGY, 11E 6 Fluid ...
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