6 Written Questions

1. like arterioles but contain unoxygenated blood. they are very porous to permit the movement of wbc's and fluid.
2. walls of these have pores that are covered with a very thin membrane that permits greater permeability of fluids and small molecules and are found in areas where absorption takes place.
3. they are the smallest blood vessels and only consist of a tunica intima. they function as the site of exchange.
4. opposite of arteries that contain back flow valves and have low blood pressure.
5. they control how much blood is going to a tissue.
6. opposition to flow, a measure of the amount of friction the blood encounters as it flows through vessels.

6 Multiple Choice Questions

1. blood viscosity, total blood vessel length, blood vessel diameter.
   1. blood pressure
   2. resistance
   3. fenestrated capillaries
   4. three sources of resistance
2. the middle layer of the blood vessel that functions to change the diameter of the blood vessel.
   1. lumen
   2. Tunica Adventitia
   3. tunica media
   4. tunica intima
3. the thick walled arteries near the heart that expand when the ventricles contract then recoil to maintain blood pressure.
   1. arterioles
   2. capillaries
   3. muscular arteries
   4. elastic arteries
4. located in the medulla oblongata, controls the blood vessel diameter and transmits action potentials.
   1. elastic arteries
   2. resistance
   3. arterioles
   4. vasomotor center
5. very leaky capillaries, very large holes in the lining that permits leakage of molecules or cells. blood flow is very slow.
   1. sinusoidal capillaries
   2. capillaries
   3. fenestrated capillaries
   4. continuous capillaries
6. The outtermost layer of the blood vessel that is composed of collagen fibers and anchors the vessel.
   1. tunica intima
   2. elastic arteries
   3. Tunica Adventitia
   4. tunica media

6 True/False Questions

1. muscular arteries → the thick walled arteries near the heart that expand when the ventricles contract then recoil to maintain blood pressure.

   True        False

2. blood pressure → the actual blood flowing through a vessel, organ, or body.

   True        False

3. tunica intima → the innermost layer of the blood vessel

   True        False

4. lumen → the central space within the vessel where blood flows through.

   True        False

5. blood flow → the actual blood flowing through a vessel, organ, or body.

   True        False

6. continuous capillaries → The most common, they have an uninterupted lining of endothelial cells and contain very small gaps for fluid to leak through.

   True        False