+
Cards In This Set
| Front | Back |
|
1. Know the types of vessels that blood flows through away from the heart, through the circulatory system, and back to the heart.
|
Blood to arteries to arterioles to capillary beds (in tissue) to venules to veins to heart
|
|
2. Know the type of vessel where exchange takes place between the bloodstream and tissues.
|
Capillary walls
|
|
3. List the 3 layers of a blood vessel wall from outside to inside and know the characteristics/tissue types found in each layer.
|
Tunica externa
Tunica media Tunica intima |
|
4. Explain how the muscles in a blood vessel wall are controlled.
|
Muscle controlled by sympathetic NS
Sympathetic NS causes muscles to contract, reduce vessel diameter |
|
5. Describe the characteristics of an artery.
|
Thicker walls than veins (esp. tunica media)
Carry blood away from heart/ relatively closer to heart Need to expand, recoil as heart pumps (walls are stretchy and strong) |
|
6. Describe elastic and muscular arteries and give examples of each
|
Elastic: largest arteries; includes aorta and pulmonary trunk; thick tunica media
Muscular: medium sized arteries; tunica media has more smooth muscles; no recoil; maintain partial state of contraction; distributing arteries |
|
7. Define anastomosis and collateral circulation
|
Anastomosis: union of 2 arteries supplying same body region
Collateral circulation: alternate route for blood flow |
|
8. Define arteriole
|
Microscopic vessels regulating flow into capillaries
|
|
9. Describe the characteristics of a capillary
|
Smallest blood vessels
Walls are 1 cell thick (tunica intima) Form branching networks to increase surface area |
|
10. Describe the two routes through the microcirculatory system at a capillary bed
|
Through capillaries
Through thoroughfare channel |
|
11. Define precapillary sphincter
|
Smooth muscle fibers surrounding root of each capillary
|
|
12. Explain how materials move in and out of the capillaries
|
Diffusion, filtration, diffusion
Oxygen, nutrients move from blood to cells (mainly by diffusion) Carbon Dioxide, wastes go from cells to blood |
|
13. Define venule
|
Drain blood from capillaries and begin return flow to heart
|
|
14. Describe the characteristics of a vein
|
Far from heart, under low pressure (thinner walls than arteries)
Lumens are larger Have valves |
|
15. List the structural differences between an artery and a vein
|
Lumens are larger in veins
Veins have valves Arteries have bigger walls |
