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Lecture 24

Capillaries-Lymph-Veins

TermDefinition
Capillary Blood Flow Very slow-many capillaries spread flow out and reduce speed
Capillary Pressure 37 mmHg at arteriolar and down to 17mmHg at venous end
Capillary Fluid Exchange Balance of BP forcing fluid out and osmotic pressure from plasma proteins drawing fluid in. Fluid moves through capillary pores
Filtration Domainates at high pressure and (arteriolar) BP>osmotic pressure-fluid forced out.
Reabsorption At venous end lower BP, BP<osmotic pressure,fluid reenters. Net fluid sweeps volume around capillary, slightly more fluid filtered than reabsorbed.
Lymph Flow Return of excess filtered fluid to circulation
Return of Filtered Fluid Fluid enters closed-ended lymph vessels, which merge w/ others.Lymph nodes are sites of large lymph vessel merger. Large lymph vessels have valves lymph enters vena cava (BP=0) at the thoracic duct in chest.
Edema Swelling. Excess filtration (broken capillaries). Low blood protein (starvation,alcoholism). Bacteria presence and destruction draws fluid osmotically. Parasites-filariasis-black lymph flow-fatal.
Venous Flow Capacitance vessels, hold largest blood volume
Venous Pressure 17 mmHg at capillary end to 0 at vena cava. During inspiration, vessels in thorax may have negative pressure. BP needs help getting blood up to heart.
Venous Valves Prevent backflow. Every 1-2 in. in large veins. Valves can be demonstrated on veins on back of hand.
Skeletal Pump Muscle concentration squeezes veins-forces blood to heart.
Varicose Veins Ruptured valves-column of blood,slow return. Clots may form. Blood bypasses varicosites through other veins.
Created by: danamarie9323