Multiple choice

The small opening present in the middle of the kidney is

  1. renal sinus

  2. hilus

  3. cortex

  4. calyx

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The hilus is the slit-like opening in the middle of the concave medial border of the kidney. Nerves and blood vessels pass through the hilus into the renal sinus within.