The fibrous sac surrounding the kidney is called the ________.

A) renal hilum
B) adipose capsule
C) renal capsule
D) renal cortex

The renal capsule is a fibrous sac that surrounds the kidney and provides support and protection. The renal hilum is a notch on the medial surface of the kidney through which blood vessels and the ureter enter and exit. The adipose capsule is a layer of fat that surrounds the renal capsule and helps to cushion and protect the kidney. The renal cortex is the outer layer of the kidney, beneath the renal capsule.