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A & P 2 Chapter 19 - The Cardiovascular System
Terms in this set (32)
Carry blood away from the heart
What happens if you cut an artery?
It will spurt bright red blood
Contact tissue cells and directly serve cellular needs.
Carry blood towards the heart.
T/F you can feel your pulse in an artery?
T/F you can feel your pulse in a vein?
Central blood containing space
-Smooth muscle and sheets of elastin
-Sympathetic vasomotor nerve fibers control vasoconstriction and vasodilation of vessels.
Elastic Arteries are what kind of arteries?
Large thick-walled arteries with elastin in all 3 tunics
What is an elastic artery?
What kind of resistance does the large lumen offer?
What kind of arteries are distributing arteries?
Where do muscular arteries and arterioles deliver blood?
-Distal to elastic
-Deliver blood to body organs
The smallest arteries
Walls of thin tunica intima/one cell thick
Where are capillaries located?
In all tissue EXCEPT cartillage, epithelia, cornea, and lens of eye.
What do capillaries do?
They exchange gasses, nutrients, wastes, hormones, etc.
Continuous capillaries of the brain
Tight junctions are complete, forming the blood-brain barrier.
Leaky capillaries (contain pores)
Where are fenestrated capillaries located?
-VERY leaky capillaries
-Allow large molecules and blood vessels to pass between the blood and surrounding tissues.
Where are sinusoidal capillaries found?
What regulates blood flow into true capillaries?
-Formed when capillary beds unite
-Very porous; allow fluids and WBCs into tissues
When are veins formed?
When venules converge
-Have thinner walls, larger lumens compared with corresponding arteries
What is blood pressure like in veins in comparison to arteries?
Blood pressure is lower in veins than in arteries
Capacitance vessels (blood reservoirs)
How much of the blood supply do veins consist of?