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A&P Lab - Exercise 32: Blood Vessels

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tunica intima
single thin layer of endothelium that lines the lumen of a vessel
tunica media
middle coat composed of smooth muscle and elastin
tunica externa
outermost tunic composed of areolar or fibrous connective tissue
arteries
carry blood away from heart (oxygenated blood in systemic circulation) (deoxygenated blood in pulmonary circulation)
veins
carry blood to the heart (deoxygenated blood in systemic circulation) (oxygenated blood in pulmonary circulation)
aorta
largest artery of the body
pulmonary circuit
brings oxygen-poor/CO2-rich blood into close proximity of alveoli in lungs
circle of willis
anastomosis between vertebral and internal carotid arteries; unites the anterior and posterior blood supplies of brain
hepatic portal system
connects capillary beds in GI tract with those in liver without first passing through heart; allows for immediate processing of the substances in blood obtained from GI tract through digestion
fetal circulation
contains several vascular structures unique to the fetus; allows blood to bypass fetal lung, which in non-functional in utero so that umbilical vessels circulate blood to and from placenta via umbilical cord
artery (arteriole) -> capillary -> venule -> vein
pathway for circulation at site of exchange
artery (arteriole) -> capillary -> venule (vein) -> capillary -> venule -> vein
pathway for circulation at portal system
gastric vein, splenic vein, inferior mesenteric vein, superior mesenteric vein
four veins that drain into the hepatic portal vein
ligamentum arteriosum
name of ductus arteriosus in a newborn
fossa ovalis
name of foramen ovalis in a newborn
ligamentum venosum
name of ductus venosus in a newborn
ligamentum teres
name of umbilical vein in a newborn
medial umbilical ligaments
name of umbilical arteries in a newborn