1 Meanwhile, for icing, combine milk and flour in a saucepan; cook until thick. Cover and refrigerate.  In a bowl, beat butter, shortening, sugar and vanilla until creamy. Add chilled milk mixture and beat 10 minutes.
Muscular system. The muscular system is an organ system consisting of skeletal, smooth and cardiac muscles. It permits movement of the body, maintains posture, and circulates blood throughout the body. The muscular system in vertebrates is controlled through the nervous system, although some muscles (such as the cardiac muscle) can be completely autonomous.
Muscular system has the following important functions in human body; 1  MOVEMENTS OF BODY PARTS: Skeletal muscles are responsible for all voluntary movements of human body parts. 2  STABILITY AND POSTURE: Skeletal muscles stabilize human skeleton and give a proper posture to human beings.