1 Chemically, ATP is an adenine nucleotide bound to three phosphates. 2  There is a lot of energy stored in the bond between the second and third phosphate groups that can be used to fuel chemical reactions. 3  When a cell needs energy, it breaks this bond to form adenosine diphosphate (ADP) and a free phosphate molecule.
calf muscle pump. calf muscle pump. an action of the calf (soleus) muscles in which the muscles contract and squeeze the popliteal and tibial veins, forcing the blood in those veins to move upward toward the heart. Also called soleus pump.
Solving the world's problems. . . one answer at a time. The functions of the muscular system are locomotion or mobility, strength, heat production, shock absorption, shaping the body, maintaining posture, and respiration. In addition it plays a role in the digestive process by peristalsis to move the food through.keletal muscles are attached to the bones allowing for movement. Smooth muscles line many of the bodies organs aiding in digestion. Smooth muscles line the walls of arteries, these regulate blood pressure. Lastly, cardiac muscle is what comprises the heart.