Share The Cardiovascular System: Blood Vessels
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The vessel layer that has a direct role in vasoconstriction is the __________.
tunica media
Blood flows directly from __________ into capillary beds.
arterioles
The vessels that exhibit the lowest level of permeability are the __________.
continuous capillaries
When would the capillary beds surrounding the gastrointestinal organs be open?
when digesting a meal
Cardiogenic shock is most likely to result from __________.
multiple heart attacks
Blood flows from the lungs to the __________ via the __________.
left atrium; pulmonary veins
Blood from the brain is returned to the heart via the __________.
superior vena cava
The hepatic portal system collects blood from the __________ and then routes it to the __________.
GI tract; liver
The endothelium is composed of __________.
simple squamous epithelium
The inferior vena cava brings blood from the lower regions of the body and empties into the __________.
right atrium
What is the correct sequence of layers in the vessel wall from superficial to deep?
tunica externa, tunica media, tunica intima
The major long-term mechanism of blood pressure control is provided by the __________.
kidneys
Exchange of gases and nutrients occurs by diffusion between the __________.
capillaries and tissue cells
Reduction in the lumen diameter of a blood vessel as the smooth muscle contracts is known as __________.
vasoconstriction
The only vessels that provide direct access to nearly every cell in the body are the __________.
capillaries
Which of the following veins is the longest in the body?
great saphenous vein
