2.70 Nephron Structure

• Nephron is the functional unit of the kidney. The part that does the filtration and of the composition of blood.
• The aorta brings blood and through the renal artery reaches the kidney 
• The waste which is the urine then goes through the ureter to the bladder.
• The filtered blood exits the renal vein and return to the vena cava. 

If we slice through the kidney we see different colored region, the lighter colored region is called the cotex and the inner, slightly colored region is called the medulla and the lighter colored space is the pelvic region.

•  In this space it is where the urine collects and drains down the ureter.
•  The region of the different color is because the kidney is made up of millions of tubes.
•  The tube starts on the edge of the medulla and moves directly upwards through the medulla and up through the cortex and then will reach a dead-end and is called the bowman's capsule.
• The tubular structure is called the nephron
  
  

In this diagram  is the Nephron structure 

• The tube is made up of twisted section called convoluted tubules and the tube which connects the convoluted tubules into the pelvic region is called the collective duct. 

• The part the dips back into the medulla is called the Loop of Henle

• The Bowman's capsule is the dead end structure in which contains tight knot blood vessels called glomerulus.

• The first twisted section is known as the proximal convoluted tubules (PCT).

• The second twisted section is know as the Distal convoluted tubules (DCT).

It is the arrangement of the nephron which gives us the difference in color between regions in the kidney. There are millions of nephron in a single kidney.