Which of the Following is Not a Common Characteristic Shared

Question

Which of the following is not a common characteristic shared by blood and lymph capillaries?
A) They are microscopic.
B) They have a layer of endothelium.
C) They have tight-fitting cells in the endothelial layer.
D) All of the above characteristics are shared by blood and lymph capillaries.

Accepted Answer

Blood capillaries have tight junctions that can be somewhat permeable, allowing for the exchange of substances between blood and tissues. Lymph capillaries, on the other hand, have overlapping endothelial cells that act like one-way valves, permitting the entry of tissue fluid and larger particles into the lymphatic system but not allowing them to exit back into the interstitial space. This structural difference means that the statement about having tight-fitting cells in the endothelial layer does not apply universally to both types of capillaries.