Ch 19

vessel that carries blood away from heart

vessel that carries blood to heart

small artery; its diameter greatly influences blood flow and pressure

small vein

• smallest of blood vessels; connects arteriole to venule.
• its very thin wall consists only of tunica interna and allows the exchange of gases, nutrients, and waste products btwn blood and tissues

• aka tunica intima
• innermost layer of blood vessel wall

• middle layer of blood vessel wall
• consists mostly of circularly arranged smooth muscle and sheets of elastic tissue

• aka tunica adventitia
• outermost layer of blood vessel wall

simple squamous epithelium of tunica interna

small blood vessels in tunica externa of lrg blood vessels

largest artery of body and main artery of systemic cicuit

largest vein of body and main vein of systemic circuit

blood vessels that supply oxygen-rich blood to the tissues and removes oxygen-poor blood to heart

blood vessels that take oxygen-poor blood to the lungs and deliver oxygen-rich blood to the heart

• aka conducting artery
• a lrg, thick-walled vessel near heart
• having a relatively lrg amount of elastic tissue in its wall, and elastic artery can stretch during ventricular systole and rebound during ventricular diastole
• the aorta is a good ex.

• aka distributing artery
• medium-sized artery that delivers blood from and elastic artery to a specific organ
• relatively has lrg amount of smooth muscle in its wall

a cuff of smooth muscle that acts as a valve to regulate blood flow into a capillary

• valve in a vein of extremities
• prevents backflow of blood
• the cusps of the valve are folds of the tunica interna and resembles those of the semilunar valves of the heart

the prolusion of venous blood by the action of skeletal muscles

the drawing of venous blood into the thorax during inspiration

• a specialized, thin-walled vein
• ex dural sinuses of the brain
• coronary sinus of the heart

• a lateral connection btwn parallel vessels
• anastomoses can be artery-to-artery, vein-to-vein, and artery-to-veing (anteriovenous)

parallel vessels that are connected by anastamosis

• capillary whose endothelium has numerous tight junctions and allows only minimal passage of plasma and all solutes
• most common type of capillary in body

• capillary whose enothelial cells have pores that allow passage of plasma and small solutes
• fenestrated capillaries are found in enndocrine glands, the small intestine, and kidneys