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The muscular system is the biological system of humans which produces movement. The muscular system is controlled by the nervous system, although some muscles, like cardiac muscle, can be completely autonomous. Muscle is contractile tissue and is derived from the mesodermal layer of embryonic germ cells. Its functions are locomotion, vasoconstriction and vasodilatation, peristalsis, cardiac motion, posture maintenance, heat generation. It also contributes to blood glucose balance by storing energy as glycogen. Indirectly it contributes to the well-being of the organism by simply allowing a person to move about by having our skin intact to muscles help us with our facial expressions. In the nervous system it helps monitor body position. Muscles provide us with protecting our endocrine glands and digestive organs. Muscles also aid in moving blood through veins, protect deep blood vessels and help the lymphatic system move lymph.