Calcium and ATP are cofactors (nonprotein components of enzymes) required for the contraction of muscle cells. ATP supplies the energy, as described above, but what does calcium do? Calcium is ...

By some estimates, calcium handling eats up 30-50% of the ATP used in muscle contraction, so a change in calcium sensitivity could indeed explain why nitrate makes endurance exercise more efficient.

During exercise, muscles continuously break down and resynthesize the chemical ATP (adenosine triphosphate), which serves as the immediate source of energy for muscle contractions.

Calcium release triggers muscle contraction, but this can only happen after an electrical impulse from the nervous system. When the proteins interact, they can use ATP (a cellular energy source ...

Impulses from nerve cells control the contraction of each muscle ... many fibers are present. To fuel a muscle, the body makes adenosine triphosphate (ATP), which muscle cells turn into mechanical ...

more efficient at using oxygen to generate more ATP for continuous, extended muscle contractions) and is lower in older people. even after repeated injury, the concentration of satellite cells is ...

ATP (adenosine triphosphate) is the energy-carrying molecule used in cells because it can release energy very quickly. Energy is released from ATP when the end phosphate is removed. Once ATP has ...

Mahadevan, a professor of physics at Harvard University, created a theoretical model of water's role in muscle contraction ...