A projecting ridge or fin on the bottom of the hull of a boat or ship that improves directional control and is often weighted for added stability. 2. The principal structural member of an aircraft, resembling a ship's keel in shape and function.
The outer, reddish region, next to the capsule, is the renal cortex. This surrounds a darker reddish-brown region called the renal medulla. The renal medulla consists of a series of renal pyramids, which appear striated because they contain straight tubular structures and blood vessels.
The body disposes of extra waste and water through the urine, which is filtered by the kidneys from the blood. Its color is usually pale yellow, due to a natural pigment (urochrome), but this color may vary, depending on the concentration of your urine. Darker urine may mean you are...