Answer:
B. bladder
Explanation:
The function of the kidneys is the elaboration of urine. On each kidney is an adrenal gland, which is not involved at all in the formation of urine: its function is to make some hormones (see Endocrine System).
In humans, the kidneys are located on each side of the spine, in the lower back, and are surrounded by fatty tissue, the renal fat capsule. They are shaped like beans or beans, and have a convex outer edge and a concave inner edge. The latter has a hole called hilum, where blood vessels enter and leave.
On the anterior side, the renal vein that collects the blood from the kidney is located, and on the back the renal artery that carries the blood to the kidneys. (click here to see the ramifications of the renal artery).
After storage in the bladder, urine passes through a duct called the urethra to the outside of the body. Urine leakage is caused by the involuntary relaxation of a muscle: the bladder sphincter that is located between the bladder and the urethra, and also by the voluntary opening of a sphincter in the urethra.
There is only one difference between the female and male Urinary System: the male urethra is somewhat longer and is, at the same time, a urinary tract and a genital tract. In contrast, the female urethra is an exclusively urinary duct, being independent of the genital ducts.