Answer:
Contraction of the bladder
Explanation:
The tissue indicated by arrow represents "transitional epithelium" of urinary bladder. The transitional epithelium is the epithelial tissue that consists of cells with ability to change their shape. The cells of transitional epithelium of urinary bladder get stretched when the bladder is distended with urine. They resume the normal shape once the urine is excreted out of the body. So, the transitional epithelium helps the urinary bladder to expand and stretch.