Circuitry of Cardiovascular System Flashcards
Contains STRESSED VOLUME
High Pressure
Arteries
Control conduits
May rapidly dilate or constricts
site of GREATEST RESISTANCE
a1 - vasoconstricts
B2 - vasodilates
Arterioles
LARGEST TOTAL CROSS-SECTIONAL AREA
SLOWEST blood flow velocity
Has endothelial cells only
METARTERIOLES and PRE-CAPILLARY SPHINCTERS - control blood flow
Capillaries
CAPACITANCE VESSELS Under LOW PRESSURE HIGHEST PROPORTION OF BLOOD UNSTRESSED VOLUME 64% of blood found here
Veins
Drains proteins and fluids from interstitium carries chylomicrons and involved in immunity and cancer
Lymphatic Vessels
Blood flow per 100 g of tissue is GREATEST in
Kidneys
Site of HIGHEST OXYGENATION
pulmonary artery (100%)
Only arteries that contain DEOXYGENATED BLOOD
pulmonary artery and umbilical artery
Only veins that contain OXYGENATED BLOOD
pulmonary vein and umbilical vein