Describe the functions of the kidney, including the composition of fluids in the renal artery and vein.

Here are the answers to the questions about the kidney:

b) Figure 5 is a diagram showing a cross-section of a kidney. Use it to answer questions that follow.

(i) Identify parts labelled K and M.
K: Renal pelvis
M: Renal artery

(ii) Name the fluid that flows in part labelled L.
Urine

(iii) State any two differences in the composition of fluid found in M and N.

• Fluid in M (renal artery) has a higher concentration of urea than fluid in N (renal vein).
• Fluid in M (renal artery) has a higher concentration of oxygen than fluid in N (renal vein).