Arizona State Board Nail Technology Practice Exam

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What structural feature of lymphatic capillaries most directly permits uptake of relatively large particles and proteins?

A continuous basement membrane with tight junctions Overlapping endothelial cells that act as one-way minivalves A thick tunica media with smooth muscle Fenestrations controlled by precapillary sphincters

Correct Answer:

Overlapping endothelial cells that act as one-way minivalves

Explanation:

Lymphatic capillary endothelial cells overlap loosely, forming flaplike minivalves that open when interstitial pressure rises and allow fluid, proteins, and particles to enter.

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