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.
Making the world better, one answer at a time. The pharyngeal muscles help food that is getting sucked into the mouth when muscles contract through the pharynx.he muscle performs many important functions for the body. It  produces movement, maintains posture and gives shape to your body,  stabilizes joints, and generates heat. Mus â¦ cles protect your  internal organs as well.