12U4B Blood Vessels

What is the innermost layer of a vein wall called?

• Endothelium

• Tunica Externa

• Tunica Media

• Fenestrations

What is the middle layer of an artery wall called?

• Tunica Externa

• Tunica Media

• Fenestrations

• Endothelium

What do veins contain to ensure one way flow of blood?

• Muscle and elastic fibres

• Valves

• Collagen

• Fenestrations

What is the purpose of the extremely narrow lumen in capillaries?

• To maintain blood pressure

• To maximise diffusion time the tissues

• To minimise blood pressure

• To minimise the distance for diffusion at the tissues

What do capillary walls consist of?

• Valves

• Collagen

• Endothelium

• Muscle and elastic tissue

What is the purpose of the narrow lumen in arteries?

• To prevent blood from surging

• To maximize permeability for exchange at the tissues

• To maintain blood pressure

• To minimize the distance for diffusion at the tissues

What is the middle layer of a vein wall called?

• Endothelium

• Tunica Media

• Tunica Externa

• Fenestrations

What do veins have to reduce blood pressure and prevent the blood from surging?

• Wide lumen

• Collagen

• Fenestrations

• Valves

What do capillary walls contain to result in greater permeability?

• Collagen

• Endothelium

• Muscle and elastic fibres

• Fenestrations

What does the outer layer of an artery wall contain to help maintain the structure of the artery and prevent rupture?

• Fenestrations

• Muscle and elastic fibres

• Endothelium

• Collagen