Label:
excretion system,
swf
The kidneys are dark-red, bean-shaped organs. One side of the kidney bulges outward (convex) and the other side is indented (concave). There is a cavity attached to the indented side of the kidney, called the Renal Pelvis... which extends into the ureter.
Each Kidney is enclosed in a transparent membrane called the renal capsule... which helps to protect them against infections and trauma. The kidney is divided into two main areas... a light outer area called the renal cortex, and a darker inner area called the renal medulla. Within the medulla there are 8 or more cone-shaped sections known as renal pyramids. The areas between the pyramids are called renal columns.
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