Match each vascular structure to its function or characteristic. Terms may apply to more than one question. Some terms may not be used.
a.arteries
i.sinusoids
b.tunica externa
j.tunica media
c.capillaries
k.capacitance vessels
d.tunica intima
l.distributing arteries
e.lumen
m.conducting arteries
f.resistance vessels
n.metarterioles
g.medium-sized veins
o.large veins
h.venules
p.arterioles
-Capillary walls are composed of
A) two layers: the tunica media and the tunica intima.
B) a single layer of endothelium with basement membrane.
C) a single layer of connective tissue with endothelium.
D) three layers: a layer of endothelium, a layer of smooth muscle and elastic tissue, and a layer of connective tissue.

Question

Quizplus · Accepted Answer

Capillary walls are composed of a single layer of endothelium with basement membrane.

Answer: A
 Arteries have three layers: the tunica externa, tunica media, and tunica intima.

Answer: B or D
 Medium-sized veins and large veins both have tunica externa composed of connective tissue. However, large veins may also have a tunica media with smooth muscle and elastic tissue.

Answer: B or D
 Arterioles and resistance vessels both have a tunica media with smooth muscle and elastic tissue. Arterioles may also have a tunica externa composed of connective tissue.

Answer: B or D
 Distributing arteries and conducting arteries both have three layers: the tunica externa, tunica media, and tunica intima. The tunica media of conducting arteries contains more smooth muscle and elastic tissue than the tunica media of distributing arteries.

Answer: B
 Venules have a tunica externa composed of connective tissue and a thin tunica media with smooth muscle and elastic tissue.

Answer: M
 Conducting arteries are also known as elastic arteries because they contain a large amount of elastic tissue in the tunica media, allowing them to stretch and recoil during cardiac cycle.

Answer: P
 Arterioles are small arteries that are important in regulating blood flow and blood pressure to specific tissues or organs. They have a relatively thick tunica media with smooth muscle and elastic tissue.

Answer: K
 Capacitance vessels, also known as veins, have a thin tunica media with smooth muscle and elastic tissue, as well as a tunica externa composed of connective tissue. They can hold a large amount of blood and are important in maintaining blood volume and returning blood to the heart.

Answer: I or N 
 Sinusoids and metarterioles are both unique types of blood vessels. Sinusoids have a discontinuous basement membrane and are found in organs such as the liver and spleen, where they allow for the exchange of large molecules and cells between the blood and the surrounding tissue. Metarterioles are precapillary sphincters that regulate blood flow into capillaries.

Match Each Vascular Structure to Its Function or Characteristic