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________________ capillaries have a wall where the endothelial cells fit very tightly together- least permeable- most common- skin and muscles- small intercellular cleft
Who would most agree with Reverend Nathaniel Paul's exhortation to African Americans to "enter the field with a fixed determination to live and die in the holy cause" of abolition of slavery?
When sphincters are open, blood flows through ______ capillaries
When sphincters are closed, blood flows through the __________________-___________________ channel and bypasses true capillaries
____________ capillaries are ragged and have many holes/spaces for molecules to pass- most permeable- occurs in special locations (e.g. liver, bone marrow, spleen)- large intercellular cleft
__________ arteries have large lumens and lots of elastin- largest
Capillaries are JUST large enough to allow _________-______ passage of RBCs
Who played the most important role in promoting educational reform?
Molecules can pass through gaps or spaces in between the simple squamous cells of the endothelium called ?
The regulation of blood flow at the capillaries only occurs in the mesentery, or _____________ region
When the left ventricle contracts, the blood goes to the first portion of the aorta called the ?
Veins are a low pressure conduit system and on their own, are unable to fight against __________ to reach the heart
Molecules can just naturally __________ across endothelial cell membranes (O2, CO2)
________________ capillaries have large pores that increase permeability and occur in areas of active absorption or filtration- kidney, small intestine, etc- slightly bigger intercellular cleft
What are the 2 mechanisms that help veins bring blood back to the heart?
The metarteriole and thoroughfare channel together are called the ?
Veins usually carry oxygen-_______ blood
What is the one exception?- No fenestrations or clefts- Complete tight junctions- Glucose is "ushered" across the walls
__________ _________ are predominantly found in the limbs and have a similar structure as the semilunar valves in the heart (two cups)
Veins always _________ blood to the heart

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