Final answer:
The missing word in the sequence of renal blood supply presented by the student is 'interlobar,' indicating that blood flows from the renal artery to segmental arteries, then to interlobar arteries before reaching the arcuate arteries.
Step-by-step explanation:
The student has asked about the proper sequence of arteries in the renal blood supply. The correct filling word in the sequence 'Renal artery -> segmental arteries -> interlobar arteries -> arcuate arteries' is 'interlobar' arteries. This is because the renal artery first divides into segmental arteries, which further branch into interlobar arteries. These interlobar arteries pass through the renal columns and reach the renal cortex. From there, they split into arcuate arteries, then into cortical radiate arteries, and finally branch into afferent arterioles that supply about 1.3 million nephrons in each kidney.