Sheep kidney dissection diagram with labeled anatomical structures.

To label the anatomical structures of the sheep kidney correctly, let's go through each part step by step based on standard kidney anatomy.

The kidney has several key regions and vessels:
- The outermost layer is the renal capsule (a protective fibrous layer).
- Inside that is the cortex, which contains nephrons and appears granular.
- Deeper inside are the medullary pyramids (triangular structures) — these contain loops of Henle and collecting ducts.
- Between the pyramids are extensions of the cortex called renal columns.
- At the tip of each pyramid is a renal papilla, where urine drains into minor calyces.
- Minor calyces merge to form major calyces, which then drain into the renal pelvis.
- The renal pelvis funnels urine into the ureter.
- Blood enters via the renal artery and exits via the renal vein. These branch into smaller vessels within the kidney.

Now, matching the arrows in the diagram:

- A points to the inner triangular region → this is a renal pyramid (part of the medulla).
- B points to the area between pyramids → this is a renal column (cortical tissue extending inward).
- C points to the very outer edge of the kidney → this is the renal capsule.
- D points to the base of a pyramid, near the center → this is likely the renal papilla (tip of the pyramid draining into calyx).
- E points to a vessel branching inside the kidney, carrying oxygenated blood → this is an interlobar artery (branch of renal artery running between pyramids).
- F points to the large red vessel entering the kidney → this is the renal artery.
- G points to the large blue vessel leaving the kidney → this is the renal vein.
- H points to the tube exiting the kidney → this is the ureter.

Let’s double-check for consistency:
- Renal artery (F) brings blood in → branches into interlobar arteries (E) → further branch into arcuate and cortical radiate arteries.
- Renal vein (G) collects deoxygenated blood from same regions.
- Ureter (H) carries urine out from renal pelvis.
- Capsule (C) surrounds entire organ.
- Cortex includes columns (B) and outer regions.
- Medulla = pyramids (A), with papillae (D) at tips.

All labels fit logically.

Final Answer:
A: Renal pyramid
B: Renal column
C: Renal capsule
D: Renal papilla
E: Interlobar artery
F: Renal artery
G: Renal vein
H: Ureter