A&P chpt 16

Match the following

• veins

• connect the smallest arteries to the smallest veins

• arteries

• return blood to the heart

• capillaries

• carry blood away from the heart

the walls of both arteries and veins consist of three layers called

• tunics

• Muscles

• Bones

• Cartilage

innermost layer of the vessel structure. Consists of simple squamous epithelium-endothelium- and produces chemicals that cause blood vessels to dilate or constrict

• tunica intima

• tunica media

• tunica externa

Middle layer of the vessel structure that is the thickest. allows the vessel to change diameter and is composed of smooth muscle and elastic tissue (considered muscle layer) stimulated by the autonomic nervous system

• tunica intima

• tunica media

• tunica externa

Outer layer of the vessel structure and is made of strong, flexible, and fibrous connective tissue. supports and protects the vessel

• tunica intima

• tunica media

• tunica externa

The arteries closest to the heart are the largest.

• true

• false

These are the body's largest arteries. AKA elastic arteries; They expand as blood surges into them and recoil when ventricles relax.

• conducting arteries

• distributing arteries

• arterioles

AKA Muscular arteries; They carry blood further away from the heart and to specific organs and areas of the body

• conducting arteries

• distributing arteries

• arterioles

These are the smallest arteries, AKA resistance vessels because they resist the flow of blood; they are connected to capillaries by short connecting vessels called metarterioles

• conducting arteries

• distributing arteries

• arterioles

select all the components that describe veins

• walls of veins are thinner because they aren't subjected to the same high pressures as arteries

• great ability to stretch, allow them to carry varying amounts of blood with no change in pressure

• can constrict extensively

• veins lie closer to the body's surface

• examples include brachial, femoral and common carotid