The main organ of the urinary system is kidneys. (The ureters seems to be least important. Till kidney stone enters these tubes. Then you forget every thing and demand the relief from the pain. The kidneys will be damaged due to over dilatation if the tubes are blocked for long time.)

this could be caused by urine backing up to a kidney because of blockage .if there is no hydronephroses then the right kidney could be compensating for a smaller left kidney

The nephron is the part of the kidney that produces urine.

One Kidney Works Fine. After donating a kidney in 2000, the physician's instructions were simple: do not play contact sports; avoid ibuprofen. The donor's remaining kidney enlarges over time and handles all the tasks previously handled by two kidneys. The donor should be able, after recovery, to resume normal activities and lifestyle.

When the kidneys become damaged, waste products and fluid can build up in the body, causing swelling in your ankles, vomiting, weakness, poor sleep, and shortness of breath. If left untreated, diseased kidneys may eventually stop functioning completely. Loss of kidney function is a serious and potentially fatal condition.

This unit is called the nephron.
nephron
nephrons
glomerulus/ glomeruli and associated nephrons
nephrons

The urethra.

It means there was enough excrement in the large intestine that it was difficult to see the kidneys during the imaging study.

You don't actually need both, a person can do fine with only one. But since they are quite important, it's nice to start out with a spare.

Nutrients the body needs ( glucose, amino acids, and other small molecules ), electrolytes ( sodium, potassium ), and water are reabsorbed into the blood at the kidney. Sodium, Potassium, and other electrolytes are monitored and reabsorbed as well.

A proteinaceous cyst of the kidney is also known as a renal cyst. The cyst will have hemorrhagic fluid as well as lesions on the kidney.

There is no specific amount of time a person will die from internal bleeding of the kidneys. Doctors will work to stop the bleeding, and a blood transfusion may be needed if the bleeding is severe. If the blood loss is slow, a transfusion may not be needed.

capsule

yes,

The main function of the female reproductive system is to create new life forms aka babys.

yes, the blood is thicker than normal so your kidneys have to work harder to filter the waste.

perirenal fat and parietal peritoneum

They are alike because, they both break down substances and hold materials(food).

A floating kidney can move. Sometimes people are born with a low kidney called an anomaly and it never bothers them. Sometimes if you loose a lot of weight the kidney can displace into the lower regions and can still function but it can cause pain. If your kidney is low and causing problems you can have a surgery to fix it to where it is supposed to be.

millions of tiny organisms called nephrons.

The renal glomeruli filters the blood in the kidneys

You don't, many people live with one kidney and you can donate a kidney if you want to.