ANP 1105 Lecture Notes - Lecture 7: Tunica Externa, Mean Arterial Pressure, Tunica Intima

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

Document Summary

Veins and arteries with roles in pulmonary circulation. main point: arteries=away in all cases. Arteries carry blood away from to heart (a=away) Made up of endothelium (simple squamous epithelial which is continuous with the endocardial lining of the heart) In vessels larger than 1mm its supported by connective tissue layer called sub endothelial layer. Supported by internal elastic lamina which is only in arteries. Thickest layer. consists of smooth muscle layer to regulate diameter or artery. Tunica adventitia (externa): connective layer. relatively thick, but not as thick as tunica media in arteries. Vaso vasorum provide blood to blood vessels since they can be too thick (more than 3 cell width) Thick-walled, large-diameter arteries near heart; highest proportion of elastin in walls (which tunica has the most elastin? media) Smooth out large pressure uctuations; recoil helps maintain pressure & ow of blood. Deliver blood to speci c organs (0. 3mm-1 cm diameter) More smooth muscle vs elastin less distensible, more vasoconstriction.