Blood Vessels Flashcards
(31 cards)
Carries blood throughout the body to supply oxygen and nutrients to tissues
Systemic circuit
Carries blood to the lungs for gas exchange
Pulmonary circuit
Carries blood away from heart
Artery
Arteries branch to form
Arterioles
Are the site of exchange
Capillaries
Carries blood back to the heart
Venules and veins
The hollow space blood flows through
Lumen
Smaller lumen and thicker walls to withstand high pressure
Arteries and arterioles
Have thinner walls and larger lumen and it is exposed to lower pressure
Veins and venules
Blood vessel walls are made up of layers called
Tunics
3 layers of blood vessel walls from superficial to deep
Tunica externa
Tunica media
Tunica intima
Composed of endothelium and basement membrane
Tunica intima
Made up of mainly smooth muscles
Tunica media
Composed mainly of collagen and elastic fibers
Tunica externa
Are blood vessels that carry blood away from the heart
Arteries
2 types of arteries
Elastic arteries
Muscular arteries
Microscopic arteries that lead to capillaries
Site of greatest resistance to blood flow
Arterioles
Thin walled blood vessels that is used for exchange of substances between blood and tissue
Capillaries
3 types of capillaries
Continuous
Fenestrated
Sinusoidal
The most common type of capillaries
Complete endothelial lining
Allows exchange of water gasses and small molecules
Continuous capillaries
Contains pores in endothelial lining
Found in small intestine and kidneys
Allows for greater exchange of fluid and larger molecules
Fenestrated capillaries
The least common capillaries
Found in liver spleen and red bone marrow
Allows exchange of plasma proteins and cells
Sinusoidal capillaries
Regulates flow of blood in capillary beds
Metarterioles
Contract to limit blood flow through capillaries
Sphincters
