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.
1 Blood in the urine, also known as Haematuria, can cause darker urine. 2  Haemolytic Anemia can cause dark yellow urine color. 3  Hepatitis can cause a darker urine color. 4  Hepatitis is an inflammation of your liver, and itâs usually caused by a viral infection or some medications or even alcohol consumption. Haemolytic Anemia can cause dark yellow urine color. 2  Hepatitis can cause a darker urine color. 3  Hepatitis is an inflammation of your liver, and itâs usually caused by a viral infection or some medications or even alcohol consumption.