Women are most likely than men to get urinary tract infections because this structure is shorter in women than it is in men. where is this structure in the image

Man's urethra is longer than woman's urethra, it is mentioned in the image in the label 4.

The urethra is the outlet channel of the bladder. It has an excretory function in both sexes (exit of the urine) and moreover in the man a reproductive function (passage of the sperm).
In women, the urethra is very short (about 3.5 cm), with a diameter of about 6 mm.
Male's urethra measures about 15 cm and opens at the end of the penis. It is longer than in women, and it is composed of several parts each having a function. Because of this difference in size, women are more prone to lower urinary tract infections (cystitis).