Blood Vessels Anatomy

Which type of vessels carry blood away from the heart?

• Venules

• Veins

• Capillaries

• Arteries

What is the function of the tunica media in blood vessels?

• Protect and reinforce vessels

• Regulate vasoconstriction/vasodilation

• Control flow into capillary beds

• Serve cellular needs

Where are continuous capillaries abundant?

• Liver

• Skin and muscles

• Small intestines

• Endocrine glands

What is the main function of postcapillary venules?

• Deliver blood to body organs

• Regulate blood flow into the capillary

• Allow fluids and WBCs to pass to tissues

• Control flow into capillary beds

What is the purpose of valves in veins?

• Regulate vasoconstriction/vasodilation

• Prevent backflow of blood

• Control flow into capillary beds

• Allow low-resistance conduction of blood

Where are sinusoids found in the body?

• Liver

• Lungs

• Heart

• Brain

What is the function of metarterioles in capillary beds?

• Regulate blood flow into the capillary

• Link arterioles and capillaries

• Connect an arteriole directly with a postcapillary venule

• Control flow into capillary beds

Which type of capillaries have greater permeability to solutes and fluids?

• Fenestrated

• Muscular

• Continuous

• Sinusoids

What is the main function of arteriovenous anastomoses?

• Regulate vasoconstriction/vasodilation

• Provide alternate pathways for blood to reach a given body region

• Bypass or flood the capillary bed

• Control flow into capillary beds

What is the composition of the tunica externa in veins?

• Smooth muscle and elastic fibers

• Collagen fibers and elastic networks

• Endothelium with spreaded basal lamina

• Thick tunica media with more smooth muscle