AP BIOLOGY

Detailed explanation-1: -The urine flows from the kidneys through the ureters to the bladder. The urine is stored in the bladder until it leaves the body through the urethra.

Detailed explanation-2: -Urethra. A tube located at the bottom of the bladder that allows urine to exit the body during urination. All parts of the urinary tract-the kidneys, ureters, bladder, and urethra-must work together to urinate normally.

Detailed explanation-3: -A ureteral stricture is a narrowing of this tube. When a narrowing in the ureter occurs, the kidney cannot function normally and will be damaged over time. There will also be dilation of the kidney (known as hydronephrosis).

Detailed explanation-4: -The membranous urethra is the narrowest and tightest part of the urethra, so it helps you hold urine in. It’s surrounded by a circular muscle called a sphincter.

Detailed explanation-5: -The urine flows from the kidneys to the bladder through two thin tubes of muscle called ureters, one on each side of your bladder. Your bladder stores urine. Your kidneys, ureters, and bladder are part of your urinary tract. You have two kidneys that filter your blood, removing wastes and extra water to make urine.