Biology
Describe the structure of kidney with the help of a labelled diagram.
Excretory System
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Answer
Internally, each kidney is composed of an outer darker region called cortex and an inner lighter region called medulla. The medulla drains the urine into a funnel-shaped structure called the renal pelvis. Inside the kidney, there are millions of microscopic tubular structures called renal tubules or nephrons. The nephron is also called unit of kidney. Each nephron starts as a cup-like Bowman's capsule which continues behind as a narrow tubule. The tubule is convoluted and opens into a collecting duct. All the collecting ducts then open into the renal pelvis which leads into the ureter.
Below diagram shows the structure of the kidney:
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