ANP 1105 Lecture 4: Topic 4.3 Notes (Blood Vessels)

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

Document Summary

Arteries arterioles capillaries venules veins. Vessels all have the same structure (except for the thinnest vessels) Lumen: interior diameter: larger in veins than in arteries. Veins don"t have an internal elastic membrane veins aren"t stretchy or elastic: arteries need to be able to stretch because they see bursts of increased volume, need to be stretchy to accommodate and recoil. Elastic (conducting) arteries: thick walled, large diameter arteries, near the heart (aorta and the first few branches, highest proportion of elastin, smooth out pressure fluctuations, recoil helps maintain pressure and blood flow. Muscular (distributing) arteries: deliver blood to specific organs, more smooth muscle vs. elastin, other branches of the major vessels. Arterioles: tunica media is primarily smooth muscle, a single layer in the smallest arterioles, determine which capillary beds are flushed. Walls are only a thin layer or tunica intima. Continuous capillaries (a): found in skin and muscles, uninterrupted lining.