Use the drop-down menus to complete each sentence.

The renal capsule is a
✔ tough outer kidney cover
.

A sphincter is a
✔ flow-control muscle
.

The urethra is a
✔ bladder exit tube
.

Renal is a word that means
✔ relating to the kidney
.

The renal cortex is a
✔ blood-filtering tissue
.