Layers of The Blood Vessels

Question 1

The intima: makeup + function

Answer 1

• Single sheet of endothelial cells resting on a thin layer of connective tissue
• Mechanically weak
• Main barrier to plasma proteins
• Secretes many vasoactive products

Question 2

The media: makeup + function

Answer 2

• Layer of smooth muscle in a matrix of elastin + collagen

- Provides: mechanical strength, elasticity + contractile power to the vessel

Question 3

The adventitia

Answer 3

• Connective tissue sheath
• Tethers vessels loosely in place
• In large arteries contains vasa vasorum: small blood vessel network that nourishes the media