What is the medical term meaning Microscopic tube where urine is formed?

Answer 1

It is the nephron, the basic structural and functional unit of the kidneys. Its main job is to regulate waste and filter the blood and excrete toxins via urine.
the microscopic tube where urine is formed is called the nephron. They are located in the kidneys.
renal tubules

It's a complex answer. Urine is formed in the kidneys in cellular structures known as "renal parenchyma". Urine is the filtrate of blood traversing the microscopic pathways from the glomerulus to the proximal convoluted tubule, the loop of henle, and the distal convuluted tubule which is where the final condensed urine is collected.

I'm afraid the answer is not as straightforward as your question. At the beginning, urine filtrate is filtered out of the blood through a knot of capillaries called the glomerulus into an encapsulated space called the glomerular capsule. From there, the filtrate passes through a couple of tubes. The first is the proximal convoluted tubule where many of the things that were filtered out are reabsorbed back into the blood. Then the urine filtrate passes through the loop of Henle which primarily acts to reabsorb salt. This regulates our blood sodium levels and helps determine the concentration of our urine. Finally the urine filtrate passes through the distal convoluted tubule where even more refinement of the content of urine is performed. Finally, the urine will drain into a collecting duct which will drain into the calyces and eventually the ureters to the bladder.
the urethra transports urine from the bladder to the end of the penis.
the nephrons