The nephron tracker

A list gives the parts of a nephron in order, with the region in which each lies. A second list gives the filtrate of a kidney. You will answer questions about the path of the fluid, and work out the filtrate of one nephron.

The idea. The fluid passes through the parts in the order of the list. The corpuscle, the PCT and the DCT lie in the cortex.

Your tasks.

1. Finish region_of. It gives the region of a named part.
2. Finish cortex_parts. It gives the list of parts that lie only in the cortex, in order.
3. Finish per_nephron. It gives the nanolitres of filtrate formed by one nephron in a minute, from the filtrate of both kidneys in mL a minute and the number of nephrons in both kidneys.