Chapter 11. Carry blood away from the heart Arteries Arterioles.

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Presentation transcript:

Chapter 11

Carry blood away from the heart Arteries Arterioles

Exchanges between tissues and blood Capillary beds

Return blood toward the heart Venules Veins

Three layers (tunics)

Tunic intima Endothelium Tunic media Smooth muscle Tunic externa Mostly fibrous connective tissue

Walls of arteries are the thickest Lumens of veins are larger Larger veins have valves to prevent backflow Walls of capillaries are only one cell layer thick

Most arterial blood is pumped by the heart Veins use the “milking” action of muscles to help move blood

Two types of vessels Vascular shunt—vessel directly connecting an arteriole to a venule True capillaries—exchange vessels