When trying to explain to a new dialysis patient the movement of substances through the capillary pores,
the nurse will explain that in the kidneys, the glomerular capillaries have
A)
no capillary openings since this would lead to extensive hemorrhage.
B)
small openings that allow large amounts of smaller molecular substances to filter through the glomeruli.
C)
large pores so that substances can pass easily through the capillary wall.
D)
endothelial cells that are joined by tight junctions that form a barrier to medication filtration.
Ans:
B
Feedback:
The glomerular capillaries in the kidneys have small openings called fenestrations that pass directly through the middle of the endothelial cells. These allow large amounts of small molecular and ionic substances to filter through the glomeruli without having to pass through the clefts between the endothelial cells.
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