Hello There! ^_^
Your question: Which two substances are most useful for determining a patient's glomerular filtration rate..?
Your answer: Inulin and creatinine are the 2 substances that are most useful for determining a patient's glomerular filtration rate.
Hope this helps!
The 4 × 400 metres relay or long relay is an athletics track event in which teams consist of four runners who each complete 400 metres or one lap
Explanation:
Four athletes each complete one 400m lap. The first lap is run in designated lanes, as is the second – until the beginning of the back straight.