How do lymphatic vessels differ from those of either the arterial or the venous system?
A) They do not run together with either the arteries or the veins.
B) The internal valves of small to medium lymphatic vessels are spaced close enough to give the vessel the appearance of a string of beads.
C) They have fewer valves than do the veins.
D) They have thicker walls than veins, but less thick than those of the arteries.
E) They have visibly delineated tunics.

Question

Quizplus · Accepted Answer

The internal valves of small to medium lymphatic vessels are spaced close enough to give the vessel the appearance of a string of beads. This is not a characteristic of arterial or venous vessels.

Answer: A 
 Lymphatic vessels do not run together with either the arteries or the veins. This is a key difference between the lymphatic system and the circulatory system.

Answer: C 
 Lymphatic vessels have fewer valves than do the veins.

Answer: D 
 Lymphatic vessels have thicker walls than veins, but less thick than those of the arteries. This is another distinguishing characteristic of lymphatic vessels.

Answer: E 
 Lymphatic vessels do not have visibly delineated tunics. This is a characteristic of arterial and venous vessels, but not lymphatic vessels.

How Do Lymphatic Vessels Differ from Those of Either the Arterial