Mass transport - blood vessels and their functions Flashcards
What do arteries do
Away from heart to arterioles
Arterioles
Control blood flow from arteries to capillaries
Capillaries
Link arterioles to veins
Veins
From capillaries to heart
Layers both arteries and veins have
Tough fibrous outer layer
Muscle layer
Elastic layer
Thin inner lining
Lumen
What does touch fibrous outer layer do
Resists pressure changes
What does muscle layer do
Contract to control flow of blood
What does elastic layer do
Maintain blood pressure by stretching and springing back
What does thin inner lining do
Reduces friction because its smooth
Thin to allow diffusion
What does lumen do
Hole that lets blood flow through
Artery function of muscle layer
Thick
Constricts and dilates to control volume of blood
Artery function of elastic layer
Thick
Controls high and smooth blood pressure
Artery function of wall
Thick
Resists bursting
Arteries valves
No valves
Under constant high pressure
Tends to not flow backwards
Arteriole muscle layer function
Thicker than arteries
Restricts flow of blood so controls its movement
