ANP 1105 Lecture Notes - Lecture 12: Tunica Externa, Tunica Intima, Tunica Media

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: Jackie Carnegie

Document Summary

4. 3. 1 compare & contrast the structure of the walls of arteries, capillaries & veins. Arteries carry blood arteries arterioles capillaries venules veins. Has thicker and stretchier walla because of exposure to great pressure changes. Missing internal elastic membrane so not as stretchy and found in the end of the circulatory system so not exposed to great pressure changes. Tunica media: fine smooth muscle that regulates regulate diameter of veins, arteries Externa: vasa vasorum = blood supply for capillaries. Some branching before leading to the capillary beds. 1. elastic (conducting) arteries ex. aorta-beginning of the pathways so they have to stretch to accommodate the larger volume and recoil to push blood in forward direction: thick-walled, large-diameter arteries near heart; highest. Elastin smooth out pressure fluctuations; recoil helps maintain pressure & flow of blood. 3. arterioles: arterioles cap. beds at the same time while resting one after the other)