PowerPoint Lecture Slides prepared by Human Anatomy ...

PowerPoint? Lecture Slides

prepared by

Human

Anatomy

& Physiology Barbara Heard,

Atlantic Cape Community

College

Ninth Edition

19 C H A P T E R

? Annie Leibovitz/Contact Press Images

The Cardiovascular System: Blood Vessels: Part A

? 2013 Pearson Education, Inc.

Structure of Blood Vessel Walls

? Lumen

? Central blood-containing space

? Three wall layers in arteries and veins

? Tunica intima, tunica media, and tunica externa

? Capillaries

? Endothelium with sparse basal lamina

? 2013 Pearson Education, Inc.

Figure 19.1b Generalized structure of arteries, veins, and capillaries.

Tunica intima ? Endothelium ? Subendothelial layer ? Internal elastic membrane

Tunica media (smooth muscle and elastic fibers) ? External elastic membrane

Tunica externa (collagen fibers) ? Vasa vasorum

Valve

Lumen Artery

? 2013 Pearson Education, Inc.

Lumen Capillary network Vein

Basement membrane Endothelial cells

Capillary

Tunics

? Tunica intima

? Endothelium lines lumen of all vessels

? Continuous with endocardium ? Slick surface reduces friction

? Subendothelial layer in vessels larger than 1 mm; connective tissue basement membrane

? 2013 Pearson Education, Inc.

Tunics

? Tunica media

? Smooth muscle and sheets of elastin ? Sympathetic vasomotor nerve fibers control

vasoconstriction and vasodilation of vessels

? Influence blood flow and blood pressure

? 2013 Pearson Education, Inc.

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