Card 47 / 52: why are the endothelial walls of lymphatic capillaries unusual?
A)
the cells overlap, which acts as a one-way valve (stuff can get into the vessel, but can't get out again)
B)
the endothelial walls are lacking. Only the outer tunics are present
C)
they are absolutely impermeable
D)
they are not a true endothelium (i.e. simple squamous epithelium) but, instead, are composed of connective tissue
E)
they are several cell layers deep
Answer:
A) the cells overlap, which acts as a one-way valve (stuff can get into the vessel, but can't get out again)
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