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
-How are capillaries organized?
A) Each arteriole narrows until it becomes a capillary, after which it increases in diameter to become a venule.
B) Capillaries are organized according to the needs of the tissue; some tissues have large capillary networks because they require rapid exchange of nutrients, chemicals, or gases, whereas other areas have no capillaries because arterioles supply sufficient amounts of blood.
C) Capillaries branch off of arterioles to form a bed, or network, of many capillaries.
D) Capillaries branch into sinusoids where the exchange of nutrients and gases takes place.

Question

Quizplus · Accepted Answer

Capillaries branch off of arterioles to form a bed, or network, of many capillaries.

Answer: A, M, L
 Conducting arteries (M) and distributing arteries (L) are both large arteries that transport blood away from the heart to various parts of the body. Arterioles (A) are small arteries that regulate blood flow into capillary beds.

Answer: P
 Arterioles are small arteries that regulate blood flow into capillary beds.

Answer: F, K
 Resistance vessels (F) are arterioles and small arteries that play a major role in regulating blood pressure and blood flow to tissues. Capacitance vessels (K) are veins and venous networks that hold large amounts of blood and can quickly redirect blood flow to different areas of the body.

Answer: D, B, J
 The tunica intima (D) is the innermost layer of blood vessels that is in direct contact with the blood. The tunica externa (B) is the outermost layer of blood vessels that provides structural support. The tunica media (J) is the middle layer of blood vessels that contains smooth muscle and regulates vessel diameter.

Answer: H, G, O
 Venules (H) are small veins that collect blood from capillaries and lead into larger veins. Medium-sized veins (G) are veins that receive blood from venules and conduct it to large veins. Large veins (O) are the largest vessels that conduct blood back to the heart.

Answer: I, N
 Sinusoids (I) are specialized capillaries found in the liver, spleen, and bone marrow that allow for the exchange of larger molecules such as proteins and blood cells. Metarterioles (N) are short vessels that link arterioles and capillaries, and can bypass capillary beds to supply blood to nearby tissues when needed.

Match Each Vascular Structure to Its Function or Characteristic