Anatomy of Blood Vessels 21 Microscopic Structure of the Blood Vessels 1. Use the key choices to identify the blood vessel tunic described. Key: tunica intima tunica media tunica externa a intima 1. most internal tunic b: media 2. bulky middle tunic contains smooth muscle and elastin a intimo 3. its smooth surface decreases friction ai intima 4. tunic of capillaries a; intima bi media ci externa 5. tunic(s) of arteries and veins bi media 6. tunic that is especially thick in arteries ci externa 7. most superficial tunic 2. Servicing the capillaries is the basic function of the organs of the circulatory system. Explain this statement. Exchanges of nutrients respiratory gases, and wastes con accur only through capillary unus. All the other vessels serve simply to feed or drain capillary beds 3. Cross-sectional views of an artery and of a vein are shown here. Identify each. Also respond to the related questions that follow. artery vein Which of these vessels may have valves? veins Which of these vessels depends on its elasticity to propel blood along? arteries Which depends on the respiratory and muscular pumps? veins Explain this dependence. After blood hos possed through capillaries into veins blood pressure is not enough to return blood, Skeletal muscle contraction and valves in veins and people to get blood back to the heart. Review Sheet 21 Why are the walls of arteries relatively thicker than those of the corresponding veins? So It will be easier to compress them with skeletal muscle and have greater effect on blood flow from breathing. Major Systemic Arteries and Veins of the Body . Use the key on the right to identify the arteries or veins described on the left. brochiocephalic 1. the arterial system has one of these; the venous system has two Coronary 2. these arteries supply the myocardium external corotrd. 3. the more anterior artery pair serving the brain great sopnenous 4. longest vein in the body dorsalis pedis 5. artery on the foot checked after leg surgery deep femoral 6. serves the posterior thigh onrenic 7. supplies the diaphragm brachiou 8. formed by the union of the radial and ulnar veins cephalle basilic 9. two superficial veins of the arm renal 10. artery serving the kidney donados 11. testicular or ovarian veins inferior mesentaric common illac brachial 12. artery that supplies the distal half of the large intestine 13. drains the pelvic organs and lower limbs 14. what the external iliac vein drains into in the pelvis 15. major artery serving the arm superior mesenteric 16. supplies most of the small intestine popliteal 17. what the femoral artery becomes at the knee reliac trunk 18. an arterial trunk that has three major branches, which run to the liver, spleen, and stomach external carotici 19. major artery serving the skin and scalp of the head fibular Key: anterior tibial basilic brachial brachiocephalic celiac trunk cephalic common carotid common iliac coronary deep femoral dorsalis pedis external carotid femoral gonadal great saphenous inferior mesenteric internal carotid internal iliac fibularis phrenic popliteal posterior tibial radial renal subclavian superior mesenteric vertebral 20. two veins that join, forming the popliteal vein Dosterer tibia 21. artery generally used to take the pulse at the wrist