19. The Blood Vessels

A major difference between venules and arterioles is that:

Which of the following is not a reason that veins need valves to prevent backflow, but arteries do not?

Which of the following statements regarding arteries and veins is true?

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

Veins have smaller lumens, more elastic fibers, and more smooth muscle than arteries.

Which of the following vessels does not drain into the hepatic portal vein?

a. Splenic vein

b. Inferior mesenteric vein

c. Gastric vein

d. Renal vein

e. Superior mesenteric vein

Match the following veins with the correct description. 

__Cephalic vein      

__Great saphenous vein      

__Dural sinus      

__Azygos vein      

__Hepatic portal vein      

__Splenic vein      

__Internal jugular vein      

__Brachiocephalic veins       

__Brachial vein      

__Inferior mesenteric vein

a. Drains the posterior abdominal and thoracic walls

b. Two veins merge to form the superior vena cava

c. Receives blood from the spleen and digestive organs

d. Superficial vein in the medial leg

e. Drains the brain and face

f. Drains part of the large intestine

g. Superficial vein in the lateral upper limb

h. Deep vein of the arm

i. Drains the spleen

j. Drain the brain capillaries and cerebrospinal fluid

Trace one drop of blood from the time it enters the right atrium until it enters the left atrium. What is this circuit called?