Circulation and Lymphatic System (unit 4)

Question 1

Tunica Intima

Answer 1

-Innermost layer

-Consists of two sublayers
•Endothelial Lining
•Underlying layer of connective tissue

Question 2

Tunica Media

Answer 2

-Middle Layer

-Consists of Smooth Muscle
•Muscles contract results in vasoconstriction
•Relaxation of Smooth Muscle results in vasodilation

Question 3

Tunica Adventitia

Answer 3

• Outermost layer
• Forms a Connective sheath around the vessel
• Composed of collagen fibers
• Anchors the blood vessels in position

-The walls of some vessels are too thick to obtain nutrients via diffusion so they have their own blood supply in vessels called Vasa Vasorum