7.6 Blood Vessels And Their Functions

Question 1

Describe the structure and adaptations of artery’s?

Answer 1

Thin layer, elastic layer, muscle layer, tough outer layer
High pressure
Narrow lumen for pressure
Moves oxygenated blood
Smooth lumen for easier transport
Elastic and muscle for pump contraction
Tough outer layer for protecion

Question 2

Describe the structure of arterioles?

Answer 2

Connects artery’s to capillaries
Thinner elastic layer and more muscle to pump blood as it’s further away from the heart

Question 3

Describe the structure and adaptations of capillary’s

Answer 3

1 endothelial cell thick for good diffusion
Many of the for more SA
Small lumen for slow flow and more diffusion and puts RBC closer to walls for shorter diffusion pathway
Gaps in capillary’s for WBC can move in and out

Question 4

What are venules?

Answer 4

Links capillary’s and veins

Question 5

Describe the structure and adaptations of veins?

Answer 5

Large lumen for low pressure
Valves to prevent backflow
Smooth lumen for easy flow
Thin elastic and muscle layers as not needed for low pressure
Carries deoxygenated blood