Blood Vessels
1. An endothelial lining and underlying layer of ____________________ forms the linings
of the tunica intima of blood vessels.
2. The ____________________ of a vessel wall contains many smooth muscle cells.
3. The ____________________ of a vessel wall forms a sheath composed of connective
tissue.
4. When contraction of the smooth muscle in a blood vessel wall occurs, the vessel is
referred to as being in a condition of ____________________.
5. Relaxation of the smooth muscle in a blood vessel wall results in the vessel being in a
condition of ____________________.
6. A vessel that connects an arteriole directly to a venule, thus bypassing the capillaries, is
called an ____________________
.
7. The smallest blood vessels are called ____________________.
8. The openings or intercellular channels of capillary walls within muscle tissues are
relatively ____________________in diameter.
9. Capillaries function as part of an interconnected network called a___________________.
10. Tissues with high rates of metabolism tend to have ___________________densities of
capillaries.
11. ______________ ____________ are composed of smooth muscles that encircle the
entrances to capillaries and thus can control the distribution of blood within tissues.
12. The process called ____________________ is the cyclical change of blood flow
through a capillary.
13. The smallest veins, venules, are _____________ in size.
14. In the limbs, blood in veins must go through ___________________, folds of
endothelium.
15. Blood pooling in veins, causing distension is called _______________ ____________.
16. Other factors besides heartbeat involved in moving blood through the veins are: (3).
17. The ____________________ branches into left and right carotid arteries.
18. The ____________________ supplies blood to the left arm.