In normal individuals, there is a constant production of ketone bodies by the liver and their utilization by extrahepatic tissues. The concentration of ketone bodies in blood is maintained around 1 mg/dl. Their excretion in urine is very low and undetectable by routine urine tests (Rothera's test).
A: Examples of involuntary muscles, also known as smooth muscles, are the muscles of the urogenital tract, digestive tract, circulatory system and respiratory tract. Involuntary muscles are not controlled by the organism's will. Their actions are automatic and facilitated by the autonomic nervous system.
Muscle is a very specialized tissue that has both the ability to contract and the ability to conduct electrical impulses. Based on functionally as either voluntary or involuntary and structurally as either striated or smooth, muscles can be classified into three types: smooth (smooth involuntary) muscle, skeletal (striated voluntary) muscle and cardiac (striated involuntary) muscle.