Anatomy of blood vessels Flashcards
Pulmonary circuit
heart -> lungs -> heart
Systemic circuit
heart -> body -> heart
3 types of blood vessels
arteries (conductance)
capillaries (exchange)
veins (capacitance)
Arteries
carry O2^ blood away from heart (conductance)
Arterioles
smaller form of artery (resistance)
Capilaries
most numerous; where of O2 and CO2 between blood and tissues “exchange”
Veins
70% of blood in venous circulation “capacitance”
Tunica intima
innermost, simple squamous, thin and flat; simple squamous endothelium forms slick shiny surface
Tunica media
elastic and smooth muscle tissue; thicker in arteries than in veins bc of higher pressure; smooth muscle contracts and relaxes (effects size of lumen)
Tunica advantitia
tough connective tissue; support and protect blood vessels
Lumen
opening of vessel where blood passes
Systemic arteries are either ____ or ____ branches from aorta
direct or indirect
20% of circulation in ____
brain
Vertebral arteries and Carotid arteries join to form an _____ called the ____ that supplies the ______ with blood (located at base of brain)
anastamosis, circle of willis, brain
Hepatic portal system
Hepatic portal vein -> 2nd capillary bed, ^digestive end products ->liver; liver detoxifies bad end products and makes good digestive end products usable
Fetus gets blood through single umbilical ____ ^O2,blood goes out through paired umbilical _____ v O2
Vein, arteries
_______ sends ^O2 through umbilical vein; receives v O2 through umbilical arteries
Placenta
Ductus Venosus
blood bypasses the liver and portal system straight to the heart
Foramen Ovale
opening between 2 atria in the heart, allows blood flow from R atrium directly to L atrium
(bypasses lungs and pulmonary circuit)
Ductus arteriosis
connection between pulmonary artery and aorta, allows blood that goes through pulmonary artery to be directed to the aorta -> body
