Power Point Lecture Slide Presentation by Patty BostwickTaylor

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Power. Point® Lecture Slide Presentation by Patty Bostwick-Taylor, Florence-Darlington Technical College The Cardiovascular System

Power. Point® Lecture Slide Presentation by Patty Bostwick-Taylor, Florence-Darlington Technical College The Cardiovascular System Blood Vessel Microanatomy 11 PART B Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Blood Vessels: The Vascular System § Transport blood to the tissues and back §

Blood Vessels: The Vascular System § Transport blood to the tissues and back § Carry blood away from the heart § Arteries § Arterioles § Exchanges between tissues and blood § Capillary beds § Return blood toward the heart § Venules § Veins Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Blood Vessels: Microscopic Anatomy § Three layers (tunics) § Tunic intima § Endothelium §

Blood Vessels: Microscopic Anatomy § Three layers (tunics) § Tunic intima § Endothelium § Tunic media § Smooth muscle § Controlled by sympathetic nervous system; vasoconstriction & vasodilation § Tunic externa § Mostly fibrous connective tissue Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Differences Between Blood Vessels § Walls of arteries are thickest § Lumens of veins

Differences Between Blood Vessels § Walls of arteries are thickest § Lumens of veins are larger Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Differences Between Blood Vessels § Larger veins have valves to prevent backflow § Skeletal

Differences Between Blood Vessels § Larger veins have valves to prevent backflow § Skeletal muscle “milks” blood in veins toward the heart § Walls of capillaries are only one cell layer thick to allow for exchanges between blood and tissue Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Movement of Blood Through Vessels § Most arterial blood is pumped by the heart

Movement of Blood Through Vessels § Most arterial blood is pumped by the heart § Veins use the milking action of muscles to help move blood Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Capillary Beds § Capillary beds consist of two types of vessels § Vascular shunt

Capillary Beds § Capillary beds consist of two types of vessels § Vascular shunt —vessel directly connecting an arteriole to a venule § True capillaries —exchange vessels § Oxygen and nutrients cross to cells § Carbon dioxide and metabolic waste products cross into blood Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings

Capillary Beds § Precapillary sphinctors help redirect blood where it is needed most (ex:

Capillary Beds § Precapillary sphinctors help redirect blood where it is needed most (ex: digestive tract after a meal) Figure 11. 11 a Copyright © 2009 Pearson Education, Inc. , publishing as Benjamin Cummings